I've only done 70.3's and i have switch between one piece and two. Started with a Compressport two piece, then swapped to a 2XU one piece because all the cool kids had them. The one piece annoyed me when in my last two 70.3's i had to stop to pee around 4-6 times.

I did look at the Kiwami but for close to $400...........i think ill go back to my two piece Compressport setup for half the price.