Get one of each possible combination. It's the only way to be sure.
I had been eyeballing a GP100 for a while,
As much as I like the Rugers, the new 7 - 8 round S&W .357s are very nice.
You plan on hunting 4 legged varmits, 2 legged varmits, or just fun?
GP100 is a good hunk of metal,I would go with it.
It can do some good work and the amount of loads out there are outstanding!
Every good collection should include a good .357 Magnum.
Maybe my wife will do something crazy and I can end up with one of each