ffs dude, could u freaking fix that naga SAdow? it has no H in it. and also, its tulAk hord not tulOk.
well that been said, i think Sadow is the most powerfull, combining his great strenght, cunningness, alchemy and force+lightsaber skillz and knowledge i think he is the most powerful sith lord. and he did almost defeat the republic. now i know, so did revan, but at the time of revan, the republic was weak, considering Mandalorian wars, then Malak, so it was pretty much exausted. yet naga almost managed to breeng it to its knees at the full strenght of the republic, and was defeated not in a lightsaber fight, but by destruction of his ship, which seems pretty lame to me