[LGM]

Bigger is not always better. A baseship is 40% easier to hit than a Dreadnaught in the base game files. I tend to use Dreadnaughts over Baseships because of that tohit factor and because of speed limitations. Battleships are also faster than Dreadnaughts. A baseship is a nice hull to use against Talisman ships since they will hit you automatically anyway.

However, Cruisers, Battle Cruisers, Battleships, and Dreadnaughts all have the same tohit modifers, so among that set, bigger is better, unless speed is more important than tohit modifers.

Bigger ships also take more crew and life support to build, but usually the extra component is nothing compared to building more smaller ships which means you have to build more of those and more engines anyway.

Beware of ship size with different mods though. Some mod authors differentiate to hit modifers among all size upgrades, so there are more trade offs to consider in increasing size. If a mod is using the alternate engine/movement model, than with the hull size, they may include how many engines it takes to get one movement point. In this situations, the engines for larger ships will be proportionally higher than smaller ships, whereas in the base game, you spend less on baseship engines per kiloton.