What about x64dbg? Is that considered the standard on Windows?

I'm still fuzzy on the difference between the two, would you mind to elaborate?

There are many different technical differences that accumulated over time - we save projects as a state snapshot, not a sequence of commands[1], we save types as semantically connected structures in a database that is guaranteed to be consistent[2], use better stack tracking for arguments and variables[3], not SP/BP/whatever, slowly migrate to a new generation of IL - RzIL instead of ESIL[4], provide standard libraries signatures out of the box in the FLIRT format[5], switched to a new way of parsing and processing commands[6], provide basefind, and many other small differences.

[1] https://rizin.re/posts/introducing-projects/

[2] https://github.com/rizinorg/rizin/tree/dev/librz/type

[3] https://github.com/rizinorg/rizin/releases/tag/v0.5.0

[4] https://github.com/rizinorg/rizin/blob/dev/doc/rzil.md

[5] https://github.com/rizinorg/sigdb

[6] https://rizin.re/posts/rzshell/