Should i Grind in NIKKE or ZZZ?

So... i got two gacha game and both of is actually very awsome, BUT I DON'T KNOW WHICH ONE TO FOCUS PLAYING AT!

But i already tried this one method where i play both, i play zzz in laptop then play NIKKE in phone, it worked.... but i didn't do that to grind but only claiming the daily log-in reward.

Now, i just need to make a schdcule to play these two game.
Hmmmmmm play NIKKE at night and play ZZZ at morning? yea sure, if i can stop play ZZZ before evening so i can rest and then play NIKKE at night.

But i think i will focus on NIKKE since that game got alot of update every month... or 3 week? idk.
Okay ima focus on NIKKE, but right now? ima play Dying Light :3