It varies form shard to shard. If the few top players start to use Tarkin with geo's others will mimic it.
Theoretically there are 3-4 Teams that can be on top. But mostly shard seem to go for mimic teams somehow.
All in all Ships lacks of sheer numbers of Starfighters. The char arenas would look even worse if we only had 30 Chars.
So we need more ships in total and we need a REAL COMPLETE REWORK of ship battles. Not just reducing the starting ship count to 3 and buffing up some geo's that no one really had.
We need Capital ships that can be attacked to achieve some effects on the enemy fleet.
Attack the Bridge to block the enemies capital ship abilities.
Attack the Hangar to prevent the enemy to call reinforcements.
Attack the weapons to prevent the enemy to attack with his capital ship.
Attack the engines/ power plant to slow down the enemy capital ship.
Destroying all 4 parts grants you a victory. (Or killing all enemy fighters)
And therefor we could need some Bombers like Y-Wings or Heavy Assault fighters like B-Wings. With this and a starting line of 5 again one could plan more strategic teams. You had to decide to built an anti fighter Team. Or do you simply rush the capital ship and so on.
THAT would make fun to me. And then we could get some Fleet Raids. Possible Raids: Attacking Super Star Destroyers, Lucrehulk-class battleships, the Death Star and so on. Many potential still is there to be explored.