For completeness and arguably the best anchor chain is duplex G6 stainless. Because of its strength you can easily downsize and save weight. And your wallet will be a whole lot lighter also.
Cromox G6 - Duplex Chain
There is a YouTube sailing channel Sailing Fair Isle that talks a little about the pros and cons of the various options.
S/V Fair Isle - Anchoring 101
Well, first you have to define "best", which has not yet been done here.
Anytime someone asks me "what's the best...." my first response is usually "define best" lol
I like the sailing fairisle guy, and I wish he'd do more technical videos, but he reminds me of a friend of mine whose got like 3 PhDs, who once solved a supposedly unsolvable mathematics problem on a job interview (not one of the biggies), but has very specific opinions that are not always grounded in logic. sometimes I get the feeling both of those guys pick what they like first, then build an argument to support it.
The definition of "best" may or may not include types of water, types of substrate, initial cost, cost amortized over the lifetime of the chain, weight, volume, how the chain/rode pays down into the locker, compatibility with existing windlass gypsy, and simply availability. We don't know because the OP didn't say.