So far for me it is easily Patagonia R4. (I have worn every winter wetsuit over the last 20 years.) I also heard they are doing limited release of a plant based wetsuit that is sustainable and will change the game over the next few years. I am going to look into this one too.
Billabong sg5 hooded 5/4. This suit fits me well and is super comfy and stretchy. I tried on the r4 and a xcel dry lock 5/4 and they both felt heavy and stiff in comparison. On the same note they are probably warmer more durable suits. Try a bunch on.
xcel chest zip. I'm not a huge fan of dry lock but the infinity and even the x-zip are stretchy and warm and awesome. I'd try Patagonia but knowing that I can get a proven suit for half the price from xcel, I just can't bring myself to do it.
So far for me it is easily Patagonia R4. (I have worn every winter wetsuit over the last 20 years.)
I was gonna say 'favorite' but not 'best' unless you've tried every one out there - and then I see the legend has tried every one. What would your top 3 be jim? What is it about the patagonia suit you like so much (and that justifies the high price)? warmth? fit? performance? all of the above? like lee says you can get quality suits for so much less...