I’ve just tried running it a moment ago to compare. The output isn’t as organised/readable and it includes several tracebacks for failed checks (tlsv1.1, tlsv1.2, tlsv1.3, and compliance against Mozilla TLS configuration).
Always open to different tools but it seems testssl.sh is currently more complete
SSLyze also has a decent Python library.
The problem with it though is the license. I wanted to build it into some other tooling but the license held me back.
I ended up building my own tooling that did just what I needed and built an API around it.
As the other commenter mentioned, testssl.sh lets you can websites that aren’t public yet e.g. test environments or other private networks. As well as testing against starttls if you need to test encryption on a mail gateway.
It’s also configurable, meaning you can have it test tls protocols alone, or ciphers alone, client renegotiation alone making it quicker and easier to read if you are looking at specific areas