
With a staffie I would think the Gentle leader would be less likely to slip off the nose as you adjust the fit of the nose loop.
I have walked 5 or 6 of my breed for years without a headcollar/halter as they are not bad pullers. After staying away with them this winter in the country with lots of distracting/exciting sheep and horses I decided at LKA to get two Dajan head collars, what a difference, so much so that I made up another from bits I had at home (old child harness and various metal rings from old collars etc), pending being able to get another two at a show.
It is like having power steering. I didn't realise that even without seeming to pull, with that many there was always pressure on the leads and my shoulder was suffering for it.
Now it seems I can walk them with one finger, even though only three are on Head collars.
Yes they do sometimes try to rub them off against your legs, but as long as I keep walking it is fine, and one of the three (two year old) takes no notice of it at all, the puppy tries for a bit then accepts it, and the 9 year old will still thrust her head between your knees if you stop, LOL.