All i know is POE > Diablo all day!!!
POE is free to play
POE has an exponential amount of more options for play styles with the leveling points in a tree, items with linked sockets and gems to link for diversity how that skill will work.
POE has a 40-50 different items used as currency like diablo gold. The currency in poe has a use case of crafting items
Diablo only "crafting system" is throw some crap into the cube and transmute or go to a vendor to gamble gold, while POE crafting system has many different options to turn white items into #1 items in the game or turning rares into whites to start crafting off of
POE has hideouts you can edit and spend hours customizing to feel unique and one of a kind, Diablo you can go to a vendor to put your name on an item
POE has so many end game options it puts Diablo to shame. 16 different tiers of maps to run through, a sulfite mine to push your character to its limit, a syndicate play to upgrade items, a temple that lets you gamble double corrupting items, a heist mechanic that lets you run mini dungeons, and much more
the only pro I can see diablo having over POE is diablo is superior in PVP aspects
POE is far superior to diablo it is just a shame it doesn't get the credit