With tools like these or ripgrep it is useful to know whether the authors try to replace the old tool or not. This is usually stated somewhere in their readme or faq.

If they choose to approach some problems with different semantics, I would not recommend to alias the new tool over the old one. Just treat it as a like a separate tool and in most cases their new names are as comfortable to type as the 'legacy' tool's. The one exception that comes to my mind is 'exa' vs. 'ls'. Typing 'ls' is a single action for both hands while 'exa' has to be typed with the left hand alone (on QWERTY/Z layouts).