I literally used a multi tool to cut off a stuck kitchen sink faucet nut last night so I’m a little biased at the moment. Used a cheaper Ryobi brand multi tool to get it done.
If you’re in the US, Home Depot constantly has the Ryobi brand on sale. They may not be the “best” tool but they are significantly more affordable and get the job done. I’ve had my set for about two years and it had “orbital sander, circular saw, multi tool, drill, reciprocating saw, and like 3-4 batteries. “