Harley, it all depends on how you plan to shoot your BPCR. If you are a long range shooter - Swiss. If you are 100 -300yds, Goex will do just fine.
Swiss is the premier sporting powder because of their excellent processing procedures.
If the wallet is a factor, KIK. Goex Cartridge works well too
I've shot many pounds of Swiss - the various grades of Goex - Schuetzen (not a bad powder either though the burn rate is lower than Swiss) - KIK (has a high burn rate but on the dirty side) and even Lido, the Chinese firecracker powder.
If you don't shoot pounds of powder each month, my suggestion would be to buy a case with multiple brands and give them all a try. Ten cans of Swiss 1.5 - 5 cans of Goex FFg - 5 cans of Goex Express - 2 cans of Schuetzen FFg - 2 cans Goex Cartridge and a can of KIK FFg
The spark plug for black powder is the charcoal. There are only 3 brands that use the best charcoal, Alder Blackthorn, they being Swiss - Schuetzen and KIK (which went out of business in 2009)
The real benchmark, the top match shooters, use Swiss as the powder of choice
PS: Goex Express is the same price as Swiss!