Hey, Mikhelle, it's me again!
Considering you'll have low skills/ml and you want to rush a character, probably you'll have a big time waste on every vocation.
The bigger difference is on your autonomy. If you have someone to imbue items for you and usually hunts solo, knight will be your best option, since you'll be able to hunt in area from level 35 above and you'll be able to survive a little bit easier than other vocations.
Paladin would be the worst one, since you'll have to hunt single target until level 150 (ok, I know you can use runes but with low ml that will be of little to no help).
Druids and sorcerers may get a little bit of more exp than knights, specially if you rush from level 35~40 to 100 on Oramond's minotaurs, but you'll spend much more (since you'll be killing them using SD).
If you, otherwise, have a party, than druid will probably be your best option, since the members (specially the EK) usually are willing to help in your waste, you can rush ml easier since you'll Sio a lot and will be able to go to more challenging hunts with lower levels than solo.