.....but I’m having a hard time really justifying either over the Comp Alloy. Apart from the obvious materials, and the cork sniffery, is there any discernible difference between the Comp alloy and carbon models? The specs seem the same.
For 1.100 EUR extra you get Fox Shocks instead of Rock Shock and some fancy (no aluminium welds) Carbon frame with different colors. If you have to have Carbon, that this will always be in back of your mind, ooooo I ride Alloy. But in reality, with 20kg+ bike, really doesn't matter.
Than we would all say, carbon frame is much stiffer, big improvement in ride quality yada, yada, yada..
This is not a road bike or much lighter normal MTB. Most of us are not series competitors or ex Pro-s, that difference in Alloy vs Carbonon 20kg plus bike, would be that noticeable on our everyday rides.
For normal user, there all comes down to, I have to have Carbon and that is it, money is no problem, so Carbon is the way to go.

For me personally, even Comp Alloy is not worth it, if we set aside color choices.
I went with Basis and will change right away all the components to new 4 pistons XT, was even thinking of new 4 piston XTR and old XTR 11 speed derailleur-shifter combo.
At the end, will have better components than Alloy and Carbon Comp and have different options available. Will sell all the original components from the bike and still have money to spare to buy better fork, maybe adding dropper post, etc.
Than why even change the components you would ask? Well, that is personal preference SRAM vs SHIMANO.