[750hp]

Hydraulic rollers are the best combination of power and reliability. Solid rollers can run even more aggressive profiles to make more power on the right engine, but then the downside is lifter life (and the nagging thought that one of them will fail and leave a trail of destruction inside your engine).

A properly run in flat tappet camshaft (solid or hydraulic) will last almost for ever.

Of the 4 options of solid/hydraulic and flat/roller, the only one with a shortened service life is the solid roller.