Hi bro!
Personally, I would definitively go with the Scivation's whey protein!
At first, you said you are trying to cut and there is a lot less calories in the scivation's one. There is also less cholesterol.
As for the protein aspect, there is about 0.77g of protein for 1 gram in the scivation one and there is 0.75g of protein/1gram in the ON one. Thats little but when you calculate it for 5lbs it's about 45g more in the scivation!
For the taste I never tried the scivation, im using cyto sport's
complete whey and it's very good...I also tried the ON one and it was better, very good taste (strawberry, hummm:))
And for the price, u can get a 10lbs of scivation for about 65$ and the ON one is around 80$....so the scivation is a better product and much cheaper, so give it a try!