I began this game when 85 cap was already in place, so I cant speak to the other caps before this.

But my favorite 'cap' has been 100, and here is why.

Quests for exp, and grinding for quests. There were a lot of get 100 crystals from Mox, or get 100 keyshards.
Grinding took a while, and most of it I did without a pet.

You could pull the whole map. which we did, then hit them with the winterberry staff.

because of the quests many multiple people were grinding map after map, it was a lot of fun.