Tri suits are amazing, I use orca ones, they often have last season ones on sale on their website (at least they do in NZ), they're really comfy. Yep definately train in it at least a bit, they tend to rub in areas swim suits don't and you want to know about that before hand - they tend to rub higher up on my neck but get more comfortable after a bit of use. Everyone seems to wear wetsuits at the triathlons I've been to but I hate getting it off so usually just wear a trisuit but I get lots of stares and comments for being a bit odd If you're training in a pool just be aware they're often not very chlorine resistant so don't last that long if you're using them a lot.