For hot weather, cold water you prefer the trilam not the neop.? I thought that it would be the around way around. Hot topside, cold u/w:
1. Neoprene: no need for heavy thermal so a very thin base layer will do well top side and the neoprene suit will still keep you warm U/W.
2. Trilam: You need heavy thermals even the hot weather to stay warm in cold water.
BTW, for neoprene dry suits, I believe that O'three is the way to go. They have more advanced technology and incredible customer service. They can customize it any way you want including front zip with telescoping body yet still neoprene (compressed in 2 or 1 mm).
Which one I would use depends very much on specifics. How cold is the water? How warm is the air? Am I on a boat where taking the suit top down between dives is not a good idea? How long are my SIs going to be? Am I going to do my SI in a nice shady spot? Etc..
O'three MAY make a neoprene suit that is better quality. But, the Seaskin is such good quality that I personally could not even consider paying twice as much for an O'three. I would rather spend the same money to have 2 Seaskins so that I would always have one to use even if the other was off being repaired.
I would like a front zipper. I had a front zipper compressed neoprene suit before (a Bare XCS2 Tech). It is nice. But, it's not worth the extra cost, to me. If it were, I would have done that instead of buying the Seaskin Ultra.
No way would I want a telescopic torso on a neo suit. The Bare I had did not have a telescopic torso and did not need it. The neoprene has enough stretch and the suit should have enough room in it that even with a front zipper, you can get it over your head to don the top. It's not necessarily easy, particularly if you have on your thickest undies. But, it is very doable. The downside of all that overlapping material in the middle, for a telescoping suit, when the material is the thickness of neo suit material, is just not worth the little bit more convenience of donning the top.
To me, the best gear is gear where you never need any customer service. The Seaskin website is very clear and makes it very easy to understand how to take your measurements, how to order your suit, what your options are and how to choose them. Twice now I have been able to order a suit without any need to speak to anyone. And both times, the suit showed up on time, fit me perfectly, and is very high quality. Why pay twice as much for anything else?
With my newest suit, I was surprised and pleased at one thing that happened. I ordered an upgraded bag/changing mat with my suit, with a custom embroidered flag/name patch. On the day my suit was scheduled to ship, someone from Seaskin called me. This was during the week of Christmas. They said that the person who makes the patches for the bags was out on vacation and they wouldn't be able to make my bag for my suit until January 2nd. So, he was calling to tell me he was going to ship my suit with the deluxe bag without my patch. Then, the next week, they would make up the bag with my patch and send me that at no extra charge. I was shocked that they would go to all that trouble rather than just delaying shipment by 4 days or so (especially given it was between Christmas and New Year's at this point). I told him to please just hold the suit until the next week and ship it all when the bag was ready. He sounded pleased and surprised on his end that I would offer that. And that's what we did. They may not supply the same level of customer service as O'three, but again, I personally would not pay twice as much for whatever increment in quality of suit or service I would be getting.