Correction: Of the two, there is only one GREAT fighter, and that is Ward. Golovkin is merely a GOOD fighter.
Andre Ward is the second most complete fighter in boxing behind PBF. He can fight at all ranges with a high ring IQ and good defense.:deal
When GGG actually fights and defeats the best, or if he enters a tournament and beats all the best back to back like Ward did, then perhaps we have some jusification to place him on the same level as Ward. He hasn't done anything remotely like that as of yet, so at this stage, GGG is just an over-hyped too-old-to-be-a-prospect contender.
Ward; he's shown it against far greater competition and he's shown different ways to fight an entire fight and adjustments mid way through as well.