I have a pair of Futuro thigh-highs and a pair of pantyhose-style that I got from a medical supply place. The thigh-highs are a lot more comfortable - the grippers aren't too bad, whereas the pantyhose are even more uncomfortable around the belly and crotch than normal pantyhose. I'll wear the pantyhose if I want to stay in compression wear under slacks or jeans. I've even slept in the thigh-highs after my marathons.
Some brands are sized by shoe size. If your feet are out of proportion to the rest of your body it can be an issue. My compression pantyhose can really hurt my feet when they're swollen after a long run. OTOH, a bigger size just wouldn't fit me at all. The feet of the Futuro thigh-highs are more generously sized. Maybe because they're "unisex?"
Speed comes from what you put behind you. - Judi Ketteler