All the tent extra features will simply make your camping more comfortable.
So if you need some extra space to store your equipment look at the tents with internal pockets.
Wall vents will provide good ventilation for your tent.
If you usually camp in a hot area mesh roof would help you against the heat or it can be used as a skylight in the night during the dry season.
The availability of additional doors or the number of windows are the features you should also pay attention to depending on your needs.