Hello guys,

I'm wondering what the most efficient way to spend stamina is to reach lvl 40.

Currently I am lvl 28 with a pretty OK team, I have 38.8k power in helper squad, but only 97k total so my options are still quite limited.
Is it the best to farm event stage ?-3 to get 400 exp out of 30 stamina, or ?-4 for 500 exp out of 40 stamina.
Or should I keep progressing in campaign mode to catch the occasional raid boss which does give a big power boost if I get a good medium grade equipment.

I'm currently at stage 11-4 and I haven't been able to 3 star since stage 6 so I simply put all my units on the closest starting point to the boss and rush it for the experience.

What would you guys do? I'm currently just mixing the both cuz I do want medium grade equipment