Cafall I find is up a lot then down, up, down, up and finally get a reasonable descent. A bit meh.
Twrch I’ve not done in a long time but used to be a right arse of a climb (worse than Whites), though satisfyingly technical, but then superb flowy all the way down. Also used to have a really nice mini freeride bit at the top but that got tamed or removed. Not been since the corkscrew tunnel was removed!
The DH stuff is different in that it’s DH. Really I’d pad up and full face for it to make it worth the bother, else you’ll cautiously roll it all. It’s all rollable on Y Mynydd at least, but hitting it with a bit of speed makes it way more fun. Take care though as you can get air.
That said, uplift is only running up Pedalhounds as I understand it.
I’d go with a Twrch (newly reopened) and possibly Cafall run. The latter maybe is easier, but the former is more rewarding.