Nihl has good lightning, which is effective against Ventress, but backfires against Corran. Ventress's dueling is possibly a bit better than Nihl (though not by a lot, and his long-hilted blade should give him a strength edge, and too much raw strength has given Ventress problem), but I think Corran could match it.
Interestingly, no-one here uses a single normal lightsaber. Nihl and Corran both use longer blades, and Asajj goes for two.