We have no idea lmfao. The best we have is some statements and cross scaling. Void has only just begun fighting seriously and Blast is likely still hiding some tricks up his sleeve.
According TO Blast, Void is a bigger threat than Garou. Plus, Void absorbed Garou's godly energy and is the next major villain after him. So using that you can certainly speculate that he is superior, but his feats are unimpressive so far and he seems directly inferior to Blast in an actual confrontation, who only kept up with Garou and avoided him but couldn't really beat him based on his currently known abilities.
I'd say that based on current feats, Garou kinda stomps EV, albeit EV could keep up with his speed based on reacting to Blast ig. But based on statements and what the story seems to be building up, I'd bet EV is superior overall, but maybe not in close-combat. Also, given that Void and Garou's abilities both come from the same being, it's easy to presume that if Garou saw him use his dimensional abilities, Garou just copies it.