the collision of an electron and positron forms a photon, which can then decay into pairs of electrons, muons, taus, and quarks.
So is this the same for a proton and an antiproton? or do they form sth other than a photon?
The energy of the photons depends on the rest mass of the particles and their velocities.
The photons can produce pairs of the particles through pair production, only dependant on the rest mass of the particles produced.
A proton and an antiproton will also produce two photons, but they probably have higher energy than the collision between electron and positron.