I'd get the quality over quantity. Either way, you'd have to smoke more shag weed than higher quality, so it balances out either way. Personally, I'd like to have 4 good bong rips over hurting my lungs and getting a headache from dirt weed. Plus, getting a buddy good and stoned from a good herb always makes a good impression. I'd be embarrased to bring shag weed to the table, so yeah, go for the gold brother!