Best chimaera fleets?

Many use Biggs plus TIE fighters for target lock.

Biggs, triple tie, +1 of (my personal order of preference), fives, reaper, bistan. And scimi first reserve.

Since Tarkin and chimera are all over the top, tie reaper....chimera is miles slower than executrix. Reaper slows him down or his “I win” button will make whoever you run irrelevant.

I use Biggs, Emp TIE, Vader, Fives, boba as by main five. Fives isn’t very good on defense, but his AOE is a lot of fun

Depends on how old your shard is. I think top 30 on mine are all thrawn, fo tie, empire tie, biggs, vader, and reaper/fives. Almost no variation at all in top 50.