I like both as long as the character is written well but if I really have to choose, I would say solo as long as some of his closest friends appears from time to time similar to how Larry Hama did it during his run on the main series for example.
As GylT'Nav said, in the end it all come down to how a writer will be able to balance those two sides of Logan's personality but unfortunately it's something a lot of writers have had trouble with in recent years.
Logan is a man of wisdom
No problem Thanks for the art, so either it's a flashback (Logan is wearing his old costume) or Wolverine is coming back to the Savage Avengers series soon!
If we're only talking about the main flagship X-Men books: Chris Claremont during his first Uncanny X-Men/X-Men/Classic X-Men run, Joe Kelly during X-Men, Grant Morrison during New X-Men, Rick Remender during Uncanny X-Force, Jonathan Hickman's HOX/POX and right now I enjoy how he's written by Hickman in X-Men and Benjamin Percy in X-Force.
If we talking about his solo adventures, Claremont during the first two Wolverine minis/MCP/Wolverine ongoing, Hama during Wolverine/Weapon X and Barry Windsor Smith during MCP are the best of the best and basically established what kind of character Wolverine is, so yeah they're the ones who understand the character the best. Then Peter David during his MCP/Wolverine stories and Archie Goodwyn, Joe Duffy, Warren Ellis, Steve Skroce, Frank Tieri, Greg Rucka and Mark Millar during their Wolverine runs all understood the character perfectly too.
Not an X-Men book, but I also like how he was written when he was part of the new Fantastic Four during that short story by Walt Simonson/Art Adams, same thing recently during the first arc of Savage Avengers by Gerry Duggan/Mike Deodato Jr.