Either the Sex In Can series or the Flight will feel the tightest but your size will be the determining factor here. I am slightly above average in size (1 3/4" dia.) and they are definitely tight. Much smaller and I could not use them.
I agree with ToyTimeTim. The Sex In a Can series are much smaller (tighter) than the standard fleshlights. I don't have any experience with other brands, like the Tengas, so I couldn't offer more than speculation with those.