Quoted from Nibbles:Trade is easier in most cases.
-You don't have to let random CL people into your life and deal with tire-kickers and/or lowballers.
-It's 99/100 times local.
-You now have an additional strong-man to help you move the pins out/in.
-You don't have to redo the whole CL shitshow when trying to buy the pin you want (so many great people in the hobby, but when you're looking for the pin you're after, odds are you'll always find the one Mr Bungle).
-Usually, both parties aren't in a hurry to trade because they can typically get what they are looking for (as long as it's reasonable), so it's a more laid back interaction.
Great answer. I've always been stumped about trading & now I understand the benefits. Thx!