Viktor could win but if Quint got a hold of him Viktor would stand no chance.

Personally. Viktor would had underestimate Quint. When Selene have first encountered, she tried to cut his hand off then stab him through the heart and break off one shard.

Only reason, she had another chance, it's mainly he was not after her.

Indeed.

Besides, the only advantage Viktor had to fighting Michael is combat skills, while, Michael did use brute force.

Indeed.

Retrospectively speaking, the battle would be over. Before it starts.

I am not underestimating Viktor. Although, he would be too arrogant and fight head on.

Selene knew, she had no chance of winning head on against Quint, so she had to force Quint to human form.

Indeed.

Viktor easily killed Raze so if he lived till Quint's timeline he'll destroy him easily