To add my two cents: I have dived neoprene (Poseidon), compressed neoprene (DUI CF200), and trilaminate suits (DUI TLS350). For me, a cold water woos, neoprene is hands down the warmest, even wearing lighter underwear. The air cells in neoprene of course compress at depth, but if you wear a high quality neoprene suit, the compression will be more limited and the suit will retain a good deal of its thermal properties even at depth. I've dove a couple old Poseidon suits, Unisuit and Jetsuit (still have the Jetsuit), both made in Sweden. The neoprene is almost bullet proof, FAR more durable than trilaminate suits. You ain't getting cold in those suits. On the negative side, bring on the lead, as you need a lot of it to get down. The suits are heavy. The suits take a long time to dry. These suits also do not afford quite as much flexibility as most properly fitting trilam suits, but newer neoprene suits might be more flexible. Neoprene suits are much less expensive than trilam suits, esp when you consider the cost of the underwear you might need with the latter.
Trilaminate suits are light and dry quickly. But they are only as warm as your underwear. If you need 400g of Thinsulate to stay warm, you better have a very well fitting suit in order to be comfortable and retain flexibility. While many 400g underwear jumpsuits are quite buoyant (and can vent air slowly), trilam suits will generally require less lead than neoprene suits. Get the credit card out, because a properly fitted trilam suit (maybe custom cut) with thick underwear (that is also as thin as can be--Santi, DUI XM450) is going to cost over $3,000, maybe well over.
Compressed neoprene (very thin, like the CF200) is a balance of many of the virtues of both the neoprene and trilam suits. DUI claims that its CF200 is its most durable suit, so compressed neoprene might be more rugged than even many neoprene suits. And you might need a tiny bit less underwear with compressed neoprene, as the suit does retain at least some thermal properties. And you might need less weight than with a neoprene suit. At depth, the CF200 is hands down my favorite. Less drag than a trilam suit, and you can feel it when finning. But it is heavier and slower drying than my TLS350. And if I get the underwear right in my TLS350, maybe the TLS is slightly more flexible, but the CF200 does have inherent flexibility, even though you have to work against the material a bit. And it's also expensive, like a trilam.
The Scubapro Everdry, which I believe is 4mm "crushed" neoprene (not as thin as compressed neoprene), looks like a real winner. A positive balance of neoprene, compressed neoprene, and trilam. And it's a fraction of the cost of the latter two. Never tried it, though I've heard good things, including that it seems to be back ordered for many months just about everywhere.