Difference between solid roller and flat tappet

Inquiring minds would love to know. I’ve kicked the idea of going with a roller cam has been bouncing off my brain for five years. My 422 with a 650 solid lifter cam has gone 5.98@113 mph in the 1/8 and 9.42@138 (2860 pounds) in the 1/4. It’s getting rebuilt this winter after five years of zero issues engine wise. My sons stock stroke 360 (3200 pounds) with a 610 lift roller ran 6.54 four different times but broke a Comp Cams roller lifter bar with 50 runs on them trashing the whole engine. Hmmmmm trouble free, NO. Things like this can cause a few sleepless nights. The 360 short block I have done on my engine stand has a roller cam. The 408 short block I have finished for the start of next year has a roller cam. It will be an interesting Winter for sure.