How does a solid roller cam act vs solid flat tappet

Krooser said
A .904 flat tappet is very close to a roller in performance compared to a smaller diameter lifter.

My blown Hemi was built for street driving...I didn't over cam it. Iirc it was 240@.050 .525 lift and 113 LSA. We figured it was 600+ HP.

Wow, I bet that's a blast. Probably really snappy with that cam. Someday, someday HEMI