Outfighting the Outlander twice is better than fighting evenly with featless Kas'im, and his deflection of Valkorions lightning means Banes only impressive force ability is useless. There isn't much of a comparison in Lightsaber skill Arcann beating the greatest Jedi of his era shits on Bane needing armor to beat Jedi and never fighting anyone notable.
Arcann stomps
__________________ "Happiness is a lie. Life is horror. The light is always dying all across the universe. The last star will flicker out someday, when it does, all that remains is shadow. And I will be its king!"'-Amahl Farouk