i think round 1 would be close, i mean no matter at their strengths the difference is negligible it's all about skill unless they're just throwing sheer strength at each without concern for tactics. after all balefire is deadly no matter what the strength of the channeller

however i think that lanfear is the better combative channeller, purely because i've never seen graendal fight

round 2 would go to graendal cos i reckon she's probably has got a good couple of pound of lanfear (at least) and cos she's a dirty minx