The details you should have added were time of year, where you were going to be comping, expected temperature, and amount of snow or rain you anticipated.
"Two man tent" = two people in separate sleeping bags, barely enough room to change clothes, your boots and all their stuff is outside the tent. When it is really, really cold this is the way to go because the small tent keeps in the heat.
Three man tent = two people in sleeping bags, with some stuff inside - a bit more room - some stuff outside, and still warm at night.
four person tent = two people in sleeping bags, most all your stuff is inside warm and dry. If the temps are really cold like 0F to -20F it will be a cold morning to wake up to. But over 20F should be snug as bug in rug.
You need to look at the difference between a $60 three person tent and a $400 three person tent. The cheap tent will be ok if you are just hanging out at the beach and need a place to change, or, camping in the summer with your car not far away..... something rips, you fix it with duct tape. Expect lots of frustration putting it together and be careful not to break the flimsy poles. That $400 tent will last you a lifetime - you can set it up at night easily and quickly in heavy wind, the poles are near indestructible, the zippers will take years of abuse, a small hole will stay small due to the rip-stop fabric design.