I currently own 4 drysuits, but have a "go to" suit 99% of the time. The choices of suits for my drysuit diving has come full circle. I started out many years ago in a Whites 6mm neoprene suit. For most dives, I would wear a t-shirt and shorts as my base (and only) layer. The thing was a beast though. Weighed a ton and took forever to dry.
i eventually converted to a Bilam suit in 2001 with a Whites catalyst. It fit perfectly (still does) and served me well. It was super light weight and dried very fast. However, Bilam material would always sweat quite a bit, and the outer layer of my undergarments would collect a sheen of moisture. On winter days, this would become a thin ice layer, and I found myself getting chilled during dives. Onward I ventured to a Bare Trilam HD Tech which solved all issues. Supple material, stayed dry, still relatively light weight, and overall great suit.
Fairly recently, I started wondering about crushed neoprene suits again. I wanted to eliminate the thick base layers and find a more form fitting suit. I wanted a drysuit that dove more like a wetsuit. So I picked up a Waterproof D10. The stock size ML fit like a glove, and the suit was a joy to dive in. Warm, comfortable, thin base layers, hydrodynamic. However, the rear zipper across the shoulders, requiring a buddy to zip me in and out was bothersome.
So, finally, I came across an article about Seasoft Drysuits out of Olympia, WA made with Yamamoto neoprene. The suits were very unexpectedly dreemed by independent testers as most comfortable, most flexible, dries, easiest to doff and don, relatively light, tough material, hydrodynamic..etc. This was in a side by side comparison with DUI, BARE, Whites Fusion, Pinnacle, Waterproof, ScubaPro... The Seasoft suits got first and second place.
Well I had one custom made and I have to say that it is now my "go to" suit. The attached boots are the famous and supportive Seasoft Stealths, the suit is by far the most flexible and comfortable suit I've ever dived in, and it doesn't require much more than a thin polypropylene long undy set as an undergarment for water above about 50F. I did wear a capelene one piece base layer for recent dives in 42 degree water.
Check this suit out as well as the others.
SEASOFT Ti 5000? Drysuits - Suits