3. Steve Blum
Appeared in: Wolverine and the X-Men, The Super Hero Squad Show, Marvel Anime: X-Men (English dub), The Avengers: Earth's Mightiest Heroes, Ultimate Spider-Man, Hulk and the Agents of SMASH, Marvel Disk Wars: The Avengers (English dub)
As you can see from above, no actor to play Wolverine has appeared in as many projects as the character as Steve Blum. What's even more impressive is that they aren't all part of the same shared universe or continuity, meaning that he's gotten the chance to play different versions of the character too, which really makes him the most experienced voice actor in the role.
Blum does a fantastic job bringing out both sides to Wolverine's personality throughout his multiple portrayals. His Ultimate Spider-Man version is a good example of this. Yes, he captures the gruff, uninterested and very volatile personality of the character, but it's a bit more subtle than some of the more classic portrayals, as he leans into the the lighter side of Wolverine much more (in this adaptation at least).
Blum strikes a perfect balance, giving us a blend of the old and new, and he does it so effortlessly that there are so many who consider him the definitive voice of the character. I can't argue with that because I very nearly placed him as the top voice actor on this list. A certain classic version, however, ultimately won out.