I have used 2ndswing and I think the Titleist one is comparable. They probably even use them after trade as the new retail outlet for those used clubs. Trade in never gives you the prices you can get by selling yourself using eBay or other similar sites but you do gain in convenience and save in the time and hassle of self marketing and delivery. You also avoid that occasional buyer who will be dissatisfied and want a return or damages them and claims they were messed up in shipping. Those issues are rare but do happen. Either option I guess is better than filling up the garage with unused clubs. Good luck.

I like filling up my garage with old clubs LOL!

It's probably faster to do the trade in option, but you'll get more if you're patient and sell yourself. What's best is going to be subjective

I use a local golf shop, and they use the PGA Club Valuation List which is very good.

I use Global Golf and have been happy with their service, but as others have said you can always get more selling them yourself.