Understand that the difference between most condoms in terms of size is only at the ring.
I have yet to find a single condom I cannot wriggle my forearm into (and I box, so they're no twigs). So, per the actual shaft of the condom, size differences there aren't anything anyone is going to notice, as my arm is substantially larger than any penis. Some do differ on the shaft/length of the condom in terms of shape and design, and that can make a difference per where friction is felt more or less.
But ultimately, ring size -- the base of the condom -- is where they really differ and where those differences are most likely to be felt by the wearer.
Most Lifestyles AND Trojans condoms are about 52mm wide, which is average for all condoms. But in any given brand, especially big brands like these, you have a decent deal of some variance between styles, though that variance is generally a millimeter or two in any given direction.
[This message has been edited by Miz Scarlet (edited 08-25-2005).]