Well, your gauge might not be exact, but if you can do the math for that, I'd say go for it!!
The price on that second one is slightly better, but the first looks so soft and a lot less splitty...
If you can find itin the color you want, I'd say go with that - and also, I've been flipping through my Patternworks catalog, they have a lot of decently priced cottons, too.
I just love cotton...good luck on your sweater!!