I've got both, but I'm rather a newbie at this so take these comments with a large salt lick. TQ pieces are a lot smaller, so on a per-fire basis it saves a lot of room. To get it to take a spark, you just have to tear it open to expose some fibers. WF doesn't seem to take a spark unless you shave it down, and if it's windy those shavings blow away. I haven't tried either in the rain though, and WF advertises that it works great in the rain. Maybe the way to go is to take a bunch of TQ, and a couple of WF in case it's inclement.

Don't forget to compare with cotton-ball/vaseline tinder.

By the way, I've also tinkered with Coghlan's tinder. In all situations I've tried them with, they've been harder to get going than anything.