There are really only two things that matter about a wetsuit.
1) Can you afford it? (Don't look at £600 wetsuits if you can't afford them!)
2) Fit. This is the single most important thing - if your suit doesn't fit, it's NO use.
After you've ascertained those two little things, then the relative merits of each suit is worth consideration. Get to a tri shop and try some on first!