Either really. Depends on how comfortable you are and how many climbs you have made.
If this is your first few climbs as mage, I would recommend 10 VIT to start, then stat INT the rest of the way. Once you realize how fragile they are and get the hang of when to heal/run, you can lower this, or even stat ALL INT for max mana, but it can get dangerous.
This is softcore of course, if you are on HC i would recommend not playing mage given your current fg...
