Jessup: The standard. Showed that you could actually get better grip by going finer. That perfect blend of slip-to-grip ratio. But now made in the PRC and it doesn't cut or wear the same, but still pretty good.
Mob: Grittier than Jessup. Applies well for the most part, but the odd thing is that although the holes do keep out air bubbles, it has a stiffer backing than most grips and will occasionally bind and wrinkle on certain kinds of decks, which is worse than an air bubble, IMHO.
Iron Horse: Feels flat. If you're looking to make your shoes last, or you like pre-worn grip, get Iron Horse.
Minilogo grip: Gummy backing that doesn't quite cut or feel right. Grit surface is adequate. Take it if it's free w/ board but if you have a choice, go w/ Jessup or Mob.