This Fight will happen in Few Chapters.
laxus
Lightning Dragon Slaying Magic
Wahl
Super Long Distance Anti Material Magic Canon(potential City Buster)
Weakness Magic
He can create Robots who can use
i)Magic Nullification.
ii)Weakness Magic
iii)Resistant To Lightning and Poison
If His Robots can use it then He himself can do it.
So we can assume Wahl has advantage over laxus.
laxus
Lightning Dragon Slaying Magic
Wahl
Super Long Distance Anti Material Magic Canon(potential City Buster)
Weakness Magic
He can create Robots who can use
i)Magic Nullification.
ii)Weakness Magic
iii)Resistant To Lightning and Poison
If His Robots can use it then He himself can do it.
So we can assume Wahl has advantage over laxus.