the strongest, unupgraded unit at level 7.

It's too early to close the discussion. Not enough people have voiced their opinions yet. Just because you've expressed your opinion, does that mean we can close it? Smart guy. In my opinion, it's the Monster. Angel and Devil are very strong, but in my opinion, ignoring 50% (as far as I remember) of the armor is significant. Although, it might be a bit slow. Still, Angel and Devil will be more formidable, but overall, it's the Monster.