The Ship Class You Use Most

[apache]

Not me. I use colony ship hulls only through the first part of the game. Once I get to light cruisers though, I upgrade my colonizers and make them faster, longer range, and higher capacity colonizers. Can even mount defensive stuff if needed.
But this does not necessarily mean CLs are the most used. I put most warship production into battle cruisers, but my support, stellar manipulation, and pretty much any other miscellaneous ships are primarily standard cruisers.
So for me, I use the 3 cruiser hulls the most.