Regardless of what shotguns you think you want, or which gun others may think is the best, you will be miserable with whatever you choose, if it does not fit you well. Maybe you've already looked into this and both the BPS and the Nova work with your individual body type, I don't know. But if you haven't l suggest you do before plunking down several hundred dollars of your hard earned cash. Which ever one fits you and can shoot better with ought to be your choice.
Personal choice, for a pump gun, I think the Nova (many models) and especially the BPS are generally over-priced. At least in comparison to perfectly servicable offerings from Remington and Mossberg. It seems that when the Nova was first introduced a few years back, it was right in line with the 870 Express and 835, pricewise. Based on my observations alone, it seems about $50 to $100 higher now and I'm not sure why, unless it's been models with the recoil reducer in them.