Mine are

6 rebels

Underwhelming reinforcements and lack of outfit skins

5 residence

Same as rebels but with better reinforcements

4 empire

Great enforcer ok jet trooper and lack of storm trooper skins.

3 CIS

Most unique army ok skins and fun reinforcements

2 first order

Great reinforcements but same as empire lacks any skins.

1 clones

Great reinforcements and tons of skins