Let's play the numbers game, each from the maker's website:

Crower 63441T
Advertised Duration 260/238
Duration @ .050" 222/200
"Gross Lift" .430/.428

Zex/ Comp Cams 59300
Advertised Duration 260/268
Duration @ .050" 220/216
"Max Lift" .455/.430

By the numbers, the Zex is a more aggressive cam.