I like Calicos a lot, & think they're one of the most underrated (and misunderstood) weapons around. If your going to bet your life on a 9mm Calico, you HAVE to practice with it - right about the time your left palm heals, you'll know exactly how to wind it so it's 100%. I don't know if you can get their 22s to be absolutely reliable (I never did). If you go through a case of ammo (You should do that with every gun anyway), you WILL trust them to do whatever needs doin' (I've got two NIB C-950 pistols, each with one 100, & one 50 rd new drum (the barrels are cut for "attachments" on both),,, what IS a "good price" for a NIB preban these days?).
They're really hard to compare, because they're so different. If this is just for an investment it's the Calico hands down. I honestly think an M-4gery is better - just because the parts are EVERYWHERE. If keeping it short is critical, the bullpup is nice, & Calico's 9mm pistols are the shortest of all.
A Bushmaster bullpup lives in the truck safe (One of angled Herco toolboxes mounted under the window).
The biggest problem is when you start comparing the 223 to the 9mm...... aaarrrrrggghhh - I don't want go through that again.
Try them both if there's any possible way.
If you're lucky enough to rent a full auto Calico - DON'T hold it like an AR, you'll collect handful of HOT, HOT brass FAST!