Did some quick testing. Here are my first impressions (FWIW):
NAME CHANGER : Restrictions as to how one wants the file extensions to appear (e.g. uppercase vs lowercase, hidden or shown, etc.)
A BETTER FINDER NAME : "Free" version permits renames in groups of ten files (only) at one time. For example: The process to rename 300 photos would have to be repeated 30 times with 10 files/images done each time.
RENAME : Is the simplest to use (for my needs) and there are no limits or restrictions to the number of items or text content of titles/file extensions . . . and it's FREE