Veigars' stacking is superior
Not sure if this is the right category but here goes.
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can both stack infinitely but i just played a game where veigar had about 130 cs and his AP was already over 1k. Now if nasus had 130 cs he would be around 400 stacks (if every cs was stacked which it wouldnt but oh well) if you throw in nasus' AD and rank 5 Q he would do somewhere around 700 on his Q give or take. But thats only his Q that does that dmg. Veigars stacks apply to all of his damaging abilities.
Nasus has a great kit with a huge slow, AOE damage/armor reducing ability plus an awesome ult but everyone knows nasus can be kited if you know what youre doing. With veigar basically if he lands his stun (which is an AOE stun) than he just has to use his point and click ult and land his W and Q and youre deleted. Veigar got a nerf on his stun which put him into the ground but i think his stacks need a little work.
tl:dr veigar can have a significantly less amount of cs and still do insane dmg compared to nasus' stacking.
Side note: I'm bronze and have only been playing league since s4 so im not claiming to know very much about the champions, im more just curious to hear what the community has to say.