Need more info. What use is it for? Family camping, backpacking? 3 season use? 4 season? If backpacking I'd suggest two 2 man tents. I'm partial to "domes" of the ilk made by Sierra Designs. These are elongated to the point of being nearly rectangular floors. The dome tents tend to have more vertical walls hence more space inside.
I would like to know if I should buy a A-frame tent or a dome style tent? It needs to fit at least 4 people. Which should I choose?