Solid roller cam Vs Hyd flat tappet

My only suggestion would be to reevaluate what it is you really “want”.
If that turns out to be a solid roller, then great.
But if you had bought the correct heads for the cam you had, this thread wouldn’t even exist.

So, your interest in the roller seems more like an afterthought, perhaps as a way to avoid swapping the springs on the heads to something that would work with the current cam.