Its an interesting debate..Resin aggravates me, mostly because the molding process leaves a residue on it that requires a good cleaning, metal only a quick rinse. Even then, my primer doesn't always stick. For larger figures, resin is the better choice over metal (plastic is the best IMO, but thats too expensive for anyone other than GW) simply because it weighs a bunch less. At 54mm, the difference is negligible, and there I think its a bit of a tie. Smaller than that, well I don't think there is an advantage for the painter for metal over resin. Resin probably costs less to make (not sure myself), but I'd take metal every time.