these two balls are nothing alike. the core in the gladiators makes for an early revving controllable type reaction. The hpp is for skid flip similar to the immortal or ogre ss..just not as good at it. What i've seen from the hpp is that it's extremely sensitive and swirly. Remember that big sharp backends might work on the fresh stuff but the consistent reaction of the gladiator pearl will keep you in play longer with less trouble. font6453