Obviously, when you make two major changes in equipment, you're going to have a few awkward dives before everything is adjusted properly and you are comfortable with your new gear.
Dry suit zipper care varies with the kind of zipper. Metal zippers need lubricating fairly frequently, although after they have broken in a bit, not every dive. TiZip zippers need a smear of silicone lubricant to the docking end every once in a while, but not actually very often (at least mine doesn't).
Dry suits all eventually get wet inside, or as my friend NW Grateful Diver says, "All dry suits become wetsuits, and then you get them fixed." They can be turned inside out to dry, and even rinsed if required, and how easy that is to do depends on whether you have dry suit socks or attached boots. The socks are easy to turn inside-out, but the boots can be challenging or even impossible, which means that if you get flooded, you have to figure out how to get them dry. (Hint: A Peet's boot dryer works.)
What you look for in a dry suit depends on how you are going to use it and how much you are willing to spend. For relatively shallow (<100 ft) diving in cold water, a full neoprene dry suit means lots of insulation and minimal undergarments, but to my knowledge, also commits you to neoprene seals, which means no dry gloves. Full neoprene suits have the same compression/decompression behaviors as neoprene wetsuits, so you have to manage their expansion and the effect on your buoyancy. They are heavy and dry slowly, but they're fairly difficult to damage. They're generally cheap.
A popular choice for local, cold water diving is compressed or crushed neoprene. Such suits are also heavy and fairly stiff, but they have some intrinsic insulating quality, and they are very tough. They can have latex or neoprene seals, and I think you can put something like the SiTech user replaceable seal system on them. They are expensive.
If you travel, or if you dive in water that varies in temperature, you're better off with a laminate suit, which has no intrinsic insulation and is dependent on what you put under it. Laminate suits are lighter and dry faster (precisely how much lighter and how much faster depends on the material), but they require heavier undergarments for any given water temperature, and they are comparatively fragile. They vary widely in price, depending on whether the material is bilaminate or trilaminate (which is tougher), and how much tailoring goes into the design. Laminate suits can have latex seals and most can have neoprene -- it depends on the material. Some come with the user-replaceable seals as an option, but I think they can be installed as an after-market item on most if not all of them.
Dry suit options include seal material and/or quick change seal systems. It's important to realize that self-change wrist seals obligate you to a wrist ring, which can be annoying if you are using the suit where you don't want to use dry gloves. In addition, the neck ring can impact mobility and the ability to reach your dump valve (or your valves in doubles). Suits can be made with a neoprene collar overlying a latex seal, for additional warmth. Some now permit a choice of zipper material. Some suits come with thigh pockets -- others offer this as an option. I'm not personally aware of any suit that DOESN'T offer pockets as an option except the Fusion Sport. The Bare suit with the long torso zipper only offers one pocket, because the other one cannot be installed with that design.
As I mentioned above, suits can come with socks or boots. The advantage of socks is easy donning and easy turning inside-out to dry. The disadvantage is having to put on a boot or shoe, which can be awkward if you are packed into the suit with a couple of inches of insulation in it. You can also lose any outer boot, which takes the fin with it, which is not fun. Boots, on the other hand, have to fit, and you are stuck with whatever boot design comes with your suit (whereas with socks, you can play around with various boots until you find one you like). But they don't come off the suit . . .
The Fusions are a suit unto themselves. They are a bilaminate bag which is cut oversized, and contained within a compressive outer shell. The oversized bag allows good mobility, and the shell keeps the suit from ballooning and making buoyancy difficult. Because any outside trauma catches the shell first, the suits are hard to damage. A variety of outer shells is available, ranging from pure Lycra to pure1 mm neoprene. The thinner shell makes the suit lighter and quicker to dry, but doesn't support pockets, requiring the use of pocket shorts if you want thigh storage. The heavier skins support pockets, but sagging can be an issue if you put much in them. The front zip Fusion zipper design puts a lot of stress on the zipper where it curves, and that's where mine failed. The Fusions are very well priced and they are very durable. Some people don't like them because they are relatively annoying to put on.
For single tank divers, the question of wing versus suit really becomes moot with time. At the beginning, many people find it easier to put air in the wing and run the suit somewhat tight, because they're used to venting a wing and the wing vents very quickly (whereas in the suit, the air can get a long way from the dump valve!). But if you are properly weighted, the amount of air you need in the suit for maximal lofting of your undergarment will turn out to be just about the amount of air you need to get neutral, so as you get more comfortable with the suit and want to stay warmer, you will progressively put more air in the suit, until you don't use the wing underwater much, if at all.
although the wing is used for buoyancy only and the suit for buoyancy and warmth.
