Oh for fuck's sake, just answer the guys question. Dime and Nickel are not foreign terms. doesn't matter what size yours are, he wants to know if you'd pay more for less quantity but better quality. And considering a nickel is half the size of a dime, his question shouldn't be that puzzling to you.
To answer your question, it's about time for me. If I got time to smoke a couple J's, or one blunt, I'd go with the dime. You'll probably be just as baked and you can spread it out and stay buzzed longer. However, if you gotta be somewhere in a hurry then smoke the dank.