Vagina's come in all shapes and sizes of labia and clitoris. They all vary in tightness as well. Just like a great bbbj, I love the sensation of a tight pussy. I also love a woman who may not be as tight, but has that muscle control to clamp down on you. In my eight years in the hobby I've been lucky to have experienced both. However, for the sake of this thread, let's keep it to who was the tightest provider you've been with. For me, hands down it was SeductiveSarah, with an honorable mention going to Chislaine.
From my experience, those best at working it are MLisa and Hannah Hearte.