Definitely Kovalev. Took more risks, fought far better opposition and actually legitimized his power by knocking out top tier fighters. Golovkin fought nothing but bums and when he finally stepped up(against a smaller opponent) he lost.
They have some similarities actually. Both (IMO at least) have had their best wins taken from them on the cards. As for the question, I'll lean GGG. Kov has had a real good career but has clean legit L's. Has looked mentally fragile in there too at times
It's funny, I thought the first fight was the closer fight, GGG landed the jab all night in the rematch, clearly outboxed Clenelo. Golovkin in my view is 40-0 with the record for consecutive middle title defences. Golovkin clearly.
When comparing Ward to Golovkin, checking their bank balances might make one stand taller than the other. In relation to that, one was an american olympic gold medalist, hyped to the ****, the other an unknown in the US market from Kazahkstan. I know who made the bigger mark and who is a 'truer' fighting man. A truer warrior!
One fought mainly in his hometown with his judges and ref's, everything stacked in his favor, the other fought most of his career in a foreign land without any favors.
Of course it goes without saying Golovkin ducked a lot of champions like Saunders ('let him age a few years then I'll fight him'), Cotto ('let's fight Geale instead, Golovkin isn't proven'), Barker ('we got the call, my people said stay the hell away from that guy'), Froch ('too big, too strong ... can't make 170 with my new nose'), Canelo after Cotto ('I need time to beef up to PED-weight') ... Plus Sturm and possibly Martinez were ducked by the most feared puncher in the middleweight division, Golovkin. There are rumours he also ducked Eubank Jr to fight Kell Brook as a fill in by stealing the pens at the contract signing so the Eubanks had to go home to find a new pen allowing Golovkin to run away in fear. As much as I like Kov, you can't give him credit for late forties Hopkins, come on. His first Ward victory is probably the best win of both, but GGG beat Canelo more convincingly in their first fight. It's a battle of the robbery fights almost. GGG has better overall victories against dangerous champs of the second tier like Lemieux,Jacobs, even Brook(who is very similar size actually) and hasn't been stopped. At their best Kovalev is probably more potent but GGG is probably tougher with a better engine. Both had careers handicapped by bad promotion, serial ducking by opponents after their dangerous punching became apparent, lack of 'privilege' and obvious 'politics' working against them in key fights. Anyway, let's enjoy them both and the tears they give the ultra-tolerant 'American' boxing fans who welcomed the EE's with open arms from the beginning.