Sorry I'll be obtuse and give you a non-answer, but I'm overly passionate about multitool criticism.
The absolute best multitool you can have is just spare wrenches for what comes on your bike. Even the fanciest custom one won't be as practical, light, compact and tailored to you than a small pouch/plastic baggy with 2 3 4 5 6mm and maybe torx if your bike has them. Not to mention it will always be cheaper.
As for chain breakers this little thing is very clever and quite handy:
https://aliexpress.com/item/1005004391212401.html Available in the bundles section for 5.19
Don't fall for big multitool propaganda. They suck.
