Both Games are great, POE is free so you can give a shot if you want it. Grim Dawn on other hand like i said have a easier learning curve and more like to be played alone, since you can find items for your build farming for yourself, and for both games minions builds are good and viable for endgame ( i liked grim dawn minion items and build interaction most). Hmmm, well, i've played path of exile for 2500 hours and grim dawn for 300hours and still going, grim dawn have a easier learning curve and poe, well, even with 200+ hours you'll still be a bit lost, both are pretty good games with a vast variety of spells and skills with their own mechanics, POE can be anoying sometimes with oneshot mechanics and you'll need to trade ALOT in order to get the items you want it, or be really really lucky dropping the items for your build (rarely), still POE have more build diversity, i don't really recommend it if you're going to play on slow pace, since most of the time you're going to learn about builds, items, spells mechanics and such.

Path of exile single player