Malak lost his "teeth" as you put it ,against Revan when they fought to see who the Dark Lord of the Sith would be. lucasarts/lucas himself said/put that it was Revan who did that. and if you think that isnt possible cause they were friends....dont forget, Malak turned on Revan, as seen in KotoR I, Sith dont have friends. Everyone is out to get you and you them. just how Sith are.
as for the OP.
Malak was by far a Guardian turned evil. he has strength, brute force, and a lack of impulse control as seen in KotoR I.
Revan was more then likely a consular. why? Revan is ranked as #9 of the 19 strongest Sith of all time (Palpatine being 1 cause of the Kyber Crystal and Revan' s rank is probably lower then it should be cause Revan brushed death and only a whisper remained after the saving of Revan done by Bastila). as for skill with a saber/sword. in truth, what you train to be has nothing to do with it. look at the over-sized lawn orniment(sp?) Yoda. Yoda was a consular and we saw that little thing and his sword skills.
http://www.supershadow.com/starwars/powerful_sith.html for the ranking