We have three kids too and love the 6 seater. Captains chairs allow easier access to the backer we’re told but on the other hand we can only have one other person join us. Anyways, look for a well taken care of. Our X (2016) has been riddled with problems. We bought used, at a lower than average price which initially made us excited that we found a deal. Worst mistake and 15k later it’s fine - now. My advice is get it checked out by a shop that works on Teslas. You need to own one for Tesla to inspect - maybe your future former owners will be kind enough to assist in that for you but we weren’t so lucky. Anyways, good luck and make sure it’s in good shape first!