there are different renamers for different purposes. I use 3 myself.
I use the renamer in powertoys often, it is good for simple or regex replacements via the send to menu.
When I need to do something that doesn't fit that paradigm easily I use bulk rename utlity. For example to number files with a prefix or suffix. It is pretty good but not quite as quick as powertoys (for things that powertoys can do), if not then bulk rename is usually the way to go.
I use renamer lite - the one mentioned above for one special use case. When I want to move files with the same names (i.e. the would overwrite each other) when moved to one directory, that were previously in disc directories.. e.g. disc 1, disc 2 subfolders.. I use it to automatlically prefix the sub folder name to the track
e.g. Disc 1\01.mp3 becomes Disc 1 - 01.mp3
here is the Insert (as Prefix)