Which home ship is best post update?

My experience has mostly been that the best capital ship is whatever my opponent is running. Oh look, he's running Tarkin ... get obliterated by TIEs 2 turns before I can blow him up. Oh look, he's running Thrawn ... get blown up 2 turns before I can blow him up.

There is something seriously funky going on in arena. Enemy capital ship always seems to be faster, and it has nothing to do with enemy ITF dodging, nor gear level of the capital ship commander. My impression is that the enemy gains bonus TM whenever I beat one of his fleet ... and it happens with no Reaper on the field.