Oh yeah...Beefy was a lot bigger.
Well both of em seemed like pussies who would rather hide behind their human counterpart than fight. If they were forced to though, I'd say about a 5/10 split.
Frank is a lot faster, but Beefy is bigger and both may have powers they didn't exhibit, since Beefy is a demon dog, and Frank is an alien who chose a dog as his disguise or something iirc.