There is no best unless you know what to look for and have a bot to test on medium size scale.
Clean ip?
Guaranteed sticky time?
Price?
Connectivity?
Which kind? Static isp? How do you check if the subnet is alright or a "bad neighbourhood"?
residential? How do you know how many other devices have been associated with the ip? There's services out there who know.
No limits as per banking sites access( don't you wannabe carders ever pm or get in touch for advice, you should get a honest job and if you need to ask any one thing about this topic, you're not ready for it)
so far absolutelly nobody has provided any sort of answer addressing any of these things.
Almost all residential proxy nodes are some sort of compromised iot devices and they get rotated fast. All of them will eventually end up on some shit list and be useless, it's only a matter of time, not if.
There are some routers which are shipped with exploits or can be exploited, these are as good a proxy can be , but unethical, you wouldn't like if someone cracked your router , would you.
The best proxy is the one you make yourself, costs money, takes knowledge but its the best, there's ways to spoof l4 tcp for your own proxies.
Anyway, if you buy run off the mill proxies from legacy providers, you must check each ip before deploying they can't be trusted with a single word they say, honorable exception perhaps nodemaven for residential and static isp.
We have chatgtp these days, why don't you all read up on some catastrophic blunders the big legacy names have committed in the past, some so bad they required rebranding in name. Like assigning the same all cert to millions of exit ips. Forwarded for headers, dns leaks, you name it, one of of your dear legacy providers has done it.