I don't think there is a "best" way. I've sold on eBay, perfectly content with the results. I've sold here. I've traded here. Within the last two days, I removed an (unbid-upon) item from eBay sale because someone made a trade offer for some of the cards. I buy the Topps Factory baseball set every year, and sell the five insert cards on eBay for a (to me) ridiculous price. You gotta just find the best mix.
I kind of vowed to trade more here this year, and have done so a bit more often. Postage is the drawback, because both sides have to add that into the equation. Since my trades have been small, the postage is small, but a high percentage of the value. But whatever you do, have fun doing it.
v3