A take apart for what caliber?
I won't buy a .22 can I can't take apart.
A few years ago it was said that a sealed 9mm can was the way to go. Now user serviceable cans are coming into vogue. Both of my 9mm cans are sealed and I'm happy with them. I may change my mind after I run 5000 more rounds through them.
For 5.56 or 7.62x51, the best cans are all welded up tight. There won't be any taking them apart.
Stopping power: The power some guns have to make you stop what you are doing and get your wallet out.