It depends what you like riding really. I’ve never lived Afan personally – love Brechfa and Cwmcarn for trail centre stuff. Riding through the moss or down a rocky bermy descent at Brechfa (I think on the Raven) really sticks in my mind from a few years back. That black / red combined loop is ace.
Cwmcarn always delivers – especially at this time of year when a lot of other places are a bit swampy. The 2 reds back to back and a sneaky blue to finish is a biggish day for me (blue actually currently shut as of yesterday – I think there are trees down).
I love BMCC but wouldn’t choose to ride it at this time of year given it’s mostly hardpack mud. In the summer it’s possibly my favourite day on a bike.
BPW is decent all weather riding if you like uplift – maybe do one big day e.g Brechfa and then one uplift day?