I had a 2012 patriot with 3 car seats in the back. I am 5'10". I had to adjust my seating in the Jeep to allow for the appropriate room BUT the kid sitting behind the driver's seat and the passenger seat were forward facing not rear, which makes a world of difference. The only rear facing was my youngest, and she was in the middle. I had the height adjustable seat on the driver's side, and so I lifted up the front seat so my legs would hang lower, which allowed me to sit forward an inch or so more than I normally did, which gave plenty of room back there. If you have two, one front facing one rear, I suggest moving the rear to the middle seat (its safer that way anyways). that way it doesn't interfere with the front seats as much.
as far as cargo space, they will be nearly identical unless you load to the roof. the compass has a more sloping rear hatch which cuts into cargo room a bit at the top rear, the patriot is more square, so you do not loose that space there.
1989 Cherokee Pioneer 2" lift 31x10.5r15 hercules all trac A/T
http://goo.gl/h3lf9 youtube channel.