If you're asking about RPG's I would say the ones from Spacetime Studios like Arcane Legends or Space Legends.
Unfortunately, the best one in kind of graphics and general mechanics and features (O&C) is heavily p2w, especially in pvp.
I would go with Order and Chaos. You get a lot of hours play in the early going, later on you get PvP arenas (never liked those) but theres a ton of content
But you get what you pay for, if you dont want to spend much you might not find anything decent. The devs have to cover their costs ! Order and Chaos gave me many weeks of great gameplay, a superb game. I actually 'forced' myself to delete it as i was playing it SO much i was ignoring all my other games !