What is the best iPhone data recovery tool?

What is the best iPhone data recovery tool?

You won't find one.

ALL data on iPhones is encrypted by default, and can only be decrypted using the exact same phone it was created on along with the owner's Apple ID credentials.

So it's the same situation as was the case in the past with the now obsolete xD data cards which were also encrypted: any data you manage to recover is useless unintelligible nonsense which can't be decrypted. The only difference is that xD data encryption was far simpler and probably could eventually be decrypted.

The one to which you have no access - available only to Law Enforcement.