I typically use the slv etf for my program, and then use tomorrows numbers to trade the leveraged funds like uslv, and dslv. I cant use the values for the leveraged etf's and etn's with my program because it pumps out a range of targets and triggers that are too wide.
I'd love to trade swings but the minute I buy it goes down. Physical is better because it's purchased and stored. You don't have to see the daily swings up and down.