I do own the Aerospace and X33. It really depends how complicated (=fun) you want.
Form factors are different. X33 multiple functions operated through multiple pushers - Aerospace simpler less digital functions all operated by the (rather small) crown - can be fiddly (IMHO).
Personally I tend to grab the X33 at the moment - with the pull of the crown it can be put to sleep (no alarms go off hands go to 12:00 and digital display blanks and the watch hibernates to save power) in the watch box, but springs back to life with no re-setting when the crown is pushed back in. Very easy to operate even with gloves on as it has 4 pushers plus the crown - which is another pusher. Once the principles are mastered the operational modes are easy - just need to learn the first time.
The alarms on the X-33 are truelly loud - 60db? And will be heard above ambient noise. You can try thewatch out with a downloadable app on iPad.
However the Aerospace movement has been around for a long time so tried and tested and one might say a modern classic. Has greater wrt rating than the X33 if that’s an issue for you - but I shower with my X33 on if necessary (like on holiday near the pool and don’t want someone walking off with it).
Those are my thoughts. If you want to meet up anytime to get a hands on go - just IM me.
Martyn.