I base my decision on coldness of water. I have a sleeveless, short-legged wetsuit that I wear in a tri when the water is mid-70s. I bought a full wetsuit with arms to wear in a tri where the water can be much colder. Haven't used it yet. I'm told I'll really benefit from the extra bouyancy. The swim is the shortest part of the tri, so I'd say consider comfort (including water temp and range of motion) as well as price. What distance are you doing? For a sprint, you're just not in the water that long. For an Oly, it might make a bigger difference in fatigue for the rest of the race. Etc.
Running Mommy, who did an IM in April, used a sleeveless wetsuit. Maybe she'll chime in with an opinion.
Welcome to the boards! Lise



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