Constellation variants released

Andromeda is the now the base model. Standard bells and whistles that we already know. Good for patrols, I suppose.

The Taurus is a straight up freighter with about 100 more "freight units", but ditches the fighter to make room. Also seems to have slightly less firepower than the Andromeda, with have as many S2 missile racks (but 2x as many S1), and only one Class five weapon. Also slightly weaker shields and engines, both one level below the base model. Freight hauler and supply ship would seem to be the main focus.

The Aquila is the exploration variant. Rover instead of a fighter, long-range jump drive and sensors, higher fuel capacity, similar armament to the Taurus, and equivalent propulsion and shields. Also mentions a redesigned cockpit to maximize viewing. Awesome commercial.

The Phoenix is the luxury model. Comes with rover and an upgraded version of the P-52 Merlin (the P-72 Archimedes). Lowest cargo capacity out of all the models, and least well-armed, coming with only 4x S1 missile racks, though they're separated into two pairs with different amounts of ammo capacity. Tied with the Taurus with the weaker TR5 engine, bu has a more powerful power plant. Doesn't seem like it'd be much use in a fight. The Andromeda's got more teeth, and I doubt the Archimedes can outperform the Merlin enough to make a difference. If we go into diplomacy, it might be a good option, but I can't imagine a whole lot of situations where that'd be necessary.

TL;DR:
Andromeda: Jack-of-all-trades/firepower
Taurus: Freight hauling
Aquila: Endurance
Phoenix: More of a support ship than the Andromeda, but also pretty.

I went ahead and got the Aquila model. I was thinking about the Phoenix, but that $125 price tag isn't doing it for me.

EDIT: Got confirmation that some of the ship stats on the website were wrong, including the strength of the Phoenix's engines.