Last but not least, you should pay attention to the overall livability. Things to check include head clearance, ventilation, and number and placement of doors.
Most dome tents have a head clearance of 30-35 inches, which is usually enough for the average adult to sit. Cabin style tents provide more headroom, usually standing around 45-50 inches tall.
Ventilation is provided by either mesh windows on walls and doors or built-in vents on 4-season tents. If you mostly go camping in the warm season, pick a double-wall tent with a mesh ceiling and large mesh windows.
As for the doors, your best bet is a tent with two doors, one at each end of the shelter. This configuration allows easy in and out for all the occupants of your 3 person tent.