I actually start with the 30/50/100 stamina quest with the 3 chance time to begin. Unless you're doing GHQ, it's pretty rare to get more than a couple triple anythings in 180 stamina and you net yourself an R wild every day. It's just one R wild, but you're getting it while doing other stuff, and it's 100% for sure that you will clear that quest every time in a predictable amount of rolls.

At some other point, I eventually do the 3 N girls/2 R girls, but it depends on if I feel like doing N gacha or if I have time.