Not all tents have the same shape. However their differences in style have more than just an aesthetic purpose – it also has something to do with the space and how you can move in it.
Take a look at the Icarus 9 Person Family Camping Dome Tent. The Icarus is a Dome Tent. Instead of having a lengthwise space, it is more spread out. This makes sleeping rooms more private since they are not situated side by side. It is ideal for families with older children who will appreciate some privacy.
On the other hand, Tunnel Tents like the Sarengo 10 Person Family Camping Tunnel Tent, are structured to have a lengthwise space where the sleeping rooms, usually 2 of them, are placed side by side at one (or both ends) end of the tent. Its living area is then easily accessible to the main entrance which could be at one end of the structure, or in the middle. This is perfect for those who have smaller children who can't sleep without mom or dad being close by.
Then there are the Modular Hub & Pod tents like the Atlas + Miga Instant 8 Person Combo Camping Tent and the Axis & Zulu 10 Person Combo Family Camping Tent, which are actually combined structures with multiple tents. The beauty of the MTS (Modular Tent System) is that you have the choice of whether to join the tents together to create a bigger tent for a bigger group, or to use the tents individually. This makes it a pretty good choice for families who don't always camp together.
Last but not the least, we have hammock tents like the Rock Hopper which is for solo adventurers and used exclusively for sleeping. Its special feature has to be its capacity to be tied up to a tree so you can sleep above the ground. Ideal if you expect to deal with damp forest floors on your camping excursion, or if you are near bodies of water and mild flooding is possible.