I think it boils down to which route you want to take ,two different animals, both good in their own right.
I wouldnt limit to the bsa because of charging, I'm sure the club could charge any pcp for you. I'm a fan of the s410/510 and the daystate regal, all good in the weight stakes. Also just bought a hw95 in .22, previously had one in .177, most seem to favour the .22. Also had the hw99 wasn't overly impressed by its magical qualities. I really like my AA Prosport but this is a lump like the 97, but really good quality.
Whatever you chose have fun, ain't nothing finer than the smell of a new gun - especially walnut !