Unless you PVP it realy doesn't matter in the end.
I'm a tac and been playing for 270+ days with a Star Cruiser and I don't PVP. It all comes down to the type of gameplay you like. If you like zipping around and working on your attack angles; select and escort. If you like broadsiding with phasers and tanking, select a cruiser. In the end it's going to be a personal preference. Try out a few different options on Tribble?