Wolverine.

same

x-23.

Logan

Wolverine gets my vote.

I'm pretty sure X-23.

X-23s healing factor is better because she doesn't has an adamantium skeleton like he does. That has been stated on multiple panels.

When I get back home I will post some scans

Wolverine has the best healing feats out of any of them. Logan's healing has been stated to adapt to the damages he receives, hence why it has grown into an uber hax plot device at times. Based on statements, and at times his own admission, both Sabretooth and X-23 have a better healing factor.

Marvel Wikia reports Wolverine, Sabretooth, X-23 and Daken have the same durability: 4 on a scale what have 7 as maximum value, but it don't reports an healing factor ranking.

Instead Marvel.com report these value for durability: Wolverine 4/7, Daken 4/7, Sabretooth 4/7 and X-23 7/7.

I think these value aren't reliables because also Cyclops and Rachel Summers have a durability value of 4/7.

Daken because he doesn't suffer from adamantiun poisoning

Here are the scans I was talking about earlier.

wolverine says x-23. then I follow him

These, not those.

Between X-23 and Wolverine.

X-23, because of previously posted scan. The adamantium effects Logan's healing.

Wolverine