Grim Dawn's grind doesn't feel like an actual grind most of the time because you have the obvious gear grind (which isn't necessary) and then there's the reputation grind.
Grinding out rep isn't even that bad except for Cronely's Gang but even then, it's not a big deal. For the majority of the game, if you just play and explore, you won't have to do any sort of grinding unless you really want a specific legendary or you want the mandates/warrants for factions (which are tradeable between characters unlike the writs).
Basically, gear is a lot easier to find in Grim Dawn than PoE because there isn't a huge economy and need for trading between other players. The option is there if you want it, but the game isn't centered around it like PoE. Both are great games, I just prefer Grim Dawn at the moment because you play the game to have fun and perfect your build. Once you get to end-game, you can run Bastion of Chaos or
for gear to use on other characters, or you can just make a new build. PoE end-game is just grinding out maps to get more maps in hopes of finding something rare to trade.
So, single player - Grim Dawn. Multiplayer - PoE.