As of now, my favourite ones are Arknights and Bistro Heroes
Arknights is pretty much for the same reason as Symbiancross. Also, Kureha, you can get Orundums in Annihilation. It's a slow process to get 6k - but you get 6k of those in 2 weeks of lazy gringing (that is 1-2 annihilations a day)
Also, I've never had any problems with E2, but I'm also never rushing to E2. One of the greatiest things about Arknigts for me, is that you can clear out pretty much 92% of the content (even the later ones) with 2 and 3 Star units. So, basically, I've leveled them up to the max and now slowly E2-ing my 4 Stars.
Bistro Heroes...I wouldn't call it really a great game, but its a relaxing one for sure. Cute characters, cute story, cute food. Bit grindy.
I've also played Raid:Shadow Legends, but...eh...don't think people here would be interested in me ranting about that game
