One Piece Wetsuit vs. Farmer John

[ththooft]

Hello-
I am a new diver and am debating between a one piece wetsuit and a farmer john wetsuit.  My wife also dives, and has used a farmer jane.  We have heard that a one piece is better as it has less leaks, but would a farmer john/jane be warmer?  Also, is a hooded vest the way to go, or just a hood?  I've read some earlier posts, and it appears that people go both ways. 

Thanks!