I'm not gonna class villains in this com
Laxus has always been stronger than natsu and erza.
1. He fought Hades as equal for few min in 1vs1 whereas natsu erza wendy lucy n gray were all beaten, n they were together. I'm not telling that laxus was Hades level in tenrou arc, but he was stronger than natsu gray erza lucy n wendy.
2. In tartaros arc, he one shouted tempesta without getting serious, before taking for him a huge poison dose (city size) which is deadly.
Remember that natsu had lot of difficulties against tempesta, n even in lightningfire mode he wasn't able to one shot him. Gray was able to do it coz his magic is the démons weakness.
Now let's talk about arbaless arc.
In this arc, laxus has a very beautiful n badass entrance, he saved natsu erza gray lucy wendy mest n makarov then he was going to one shot ajil with just one simple attack which was a nuclear explosion !!! JUST ONE ATTACK.
Then, he fought wahl, who is a very very powerful spriggan coz he can attack with etherion (yes the council weapon) isn't that op ? Thunder has no effect on wahl, n laxus was very very sick ! Then he really impressed me with his strategy with HIS jutsuchiki he lurned from freed, laxus is very smart. Then he was able to beat wahl with just one attack.
So luxus fullpower is much stronger than spriggans except august.
I want to clarify another point spriggans are all arriver than erza ! Ajil defeated her in 1vs1 n if biska didn't shout him with Jupiter, he would killed erza.
So laxus is much stronger than her. I think he's natsu's king dragon level. Coz laxus is fastest n smarter than him, n now he can defend himself with jutsuchiki.
Gildartz is a little bit stronger than laxus.