Why would somebody pick a Corsair over a Constellation?

Well, there's always the popular one that they just prefer the looks of one over the other. They both fulfill the same role. That is small multi-crew, small as in crew capacity, not size, multi-crew explorer, carries some cargo, carries a vehicle. Ultimately, it comes down to picking between: do I like the RSI style? Do I like the ability to have two turrets, lots of missiles? Or do I want to have less missiles, more guns, more turrets at the expense of being slightly more fragile?