People say that since we had theme arena we won't have 3v3 this month. I have not heard any mod say that though so not sure if it is true.

We should of had both, imo, since theme arena is not at all as good as 3v3 and can be finished in 1 day...

Yeah you get more frags and 3 seal and 6 summon scroll, but in 3v3 it is more moon coins and potentially a new ninja. It all comes down to what people need and personally I find those extra moon coins more valuable.