I was going to recommend X for you all the way up until you mentioned flying. If space is a premium for travel, also go smaller if you can. There are so many ITX/DTX (and a few MATX) for AMD that you're basically fine with the non-X to me. You might want to confirm compatibility before you dive in.I went with Cerberus but was so conflicted about whether to go with X. Anyone committed one way then switched later?
Upcoming build is 5950x/rtx 3080/sf750/x570 pro4 matx, and if I can make it a 4x4x4x4x quad WD sn850 nvme array.
Cerberus X seems like the way to go cos you have more options, but also don't mind a challenge, and want to maybe be able to fly with it. So space is a concern. Hoping it will fit in large carryon.
I have an X, and for my second build I was considering a non X just to have something different.