Hydraulic Roller = Good for the street, junk for the track, floats the valves at high RPM.
Solid Roller = Head-work required for install, extremely expensive, high RPM friendly.
When I did my top end, I cheaped out and bought hydraulic roller parts again. Then, I checked into what it would cost to have a custom solid roller cam made and all the necessary parts and machine work required. $1500+ if I remember correctly. Basically, I decided it was a waste of coin considering what the solid conversion would enable me to do = overrev the car which would end up hurting the bottom end.
1994 DSG SVT Cobra (10.88 @ 121) - 2835 lbs
1997 Pacific Green SVT Cobra (10.34 @ 135) - 3150 lbs
2014 Ecoboost F150 - DD