I’ve got a B32 and upsized the anchor because I like to know that when it is “down and in” that I can sleep or at least rely on it in an emergency – I went for a 16KG Delta (I know… “belt and braces”!) but it certainly holds well!!
As for fitting on the roller – it fits nicely, problem is if you want to use a bowsprit / gennekar pole as the flukes obsturct the path.
Flying my again oversized asymetric from a tack line does mean that you have to be careful not to snag it on the anchor but the power is worth it!
Rocna do look good, and I guess depends on when and how much you are going to anchor….. you pay your money, you take your choice?