Jammer-Kneeskin-Bodyskin - what's best?

Back in the day it was just a plain brief papersuit for races. Now that I started swimming again there is a whole new breed of racing suits. I will be swimming ***, Back, Free and IM. I've heard the above mentioned suits are not good for *** stroke because they inhibit the kick. I have 2 questions..... 1) What are your experiences with Jammer-Kneeskin-Bodyskin suits and what strokes go well with what suit? 2) Are racing briefs long gone? Thanks for your input.