I would suggest a mixture of the both because Crystal seems to have a lot of collector raids but there will be some loaded th10 premie which you could use balloonian to go deeper into the base
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You're not so premmie but I won't suggest master. Based on your walls you will be steamrolled the minute you log off. I suggest high C3 keeping the C2 batch.
Teslas teslas and even more teslas i would say once they are all lvl 6 work switch between upgrading teslas Air D and archer towers and you should be on your way to wall grinding shortly