What's the difference with VehiculeSnap?

Not sure. I don't remember ever trying VehicleSnap and if I did there must have been something I didn't like at that time.

This is mostly just a personal mod that I updated for my own use. VehicleSnap seems more mature and easier to configure so I'd probably recommend using that if this doesn't work the way you want it to.

Okay. I'll try VehicleSnap and come back to yours if any concern arise :)

I tried VSnap and the only real difference seems to be: has a button on the hotbar that you can toggle on and off, doesn't have ability to control how aggressively it corrects. Both seem to be fine choices with no flaws in either.