I've used both, BF was hard to even out, if I did sections. If I went round & round the tire it was fine.
BF is more of a gel, which gave more of a sealant look with a mild shine & light darkening.
Use more than suggested, still won't be much. Lasting a month so far, still goin'
WG is liquid like water, each application darkens more. Need little, smells, easy on flat surfaces,
but the ridges on the tire it bubbled up and wouldn't soak in. Really liked it on trim, lasted months.
I will be using BF on my tires, just the look was more pleasing to me, worth the effort as needed.
WG on all other trim, with the darkening, and ease of use I can paint it on. Thinkin' every 2 months.