[Ted]

If it's a "true" trade, you won't have a copy of it after the trade. You'll be trading what you have for something that they have - no need to burn, in this case. If you're copying it though, a data disc would be the best way. That way, they can burn it themselves and be guaranteed to get the end product they desire. They'll also be able to trade/seed/whatever those data files without loss to quality. A disc burned for viewing or listening (a video or audio disc) will lose quality when it's ripped the next time (and with each susequent generation). That's why we have the rules on specifying the generation for discs in the lineage.