SpyBot S&D

I had SpyBot S&D as an on demand scanner along with my Norton protection. My wife removed the SpyBot program hearing it was not so useful these days

 

We still have malwarebytes as an on demand scanner with our realtime Norton

 

from what others know, should we add back SpyBot as a 2nd on demand scanner or is Malwarebytes (free) more than what I would get with SpyBot?