I've owned both. As previously stated, the 460 is the winner in the power category, and in appearance. But, I kept the ASP20. Both were in .22 cal. The Sig doesn't take a backseat to the Diana in terms of accuracy. I have several fixed-barrel guns (some them PCP), and this one will give ANY of them a run for their money. Cocking effort goes to the Sig. I also have the synthetic stock version, and it's not particularly attractive. The wood version might help some, but it's just not as "pretty or svelte" as the Diana. You can't go wrong with either. You WILL find many having had issue with the Diana's cocking pins breaking, or wearing out quickly. Mine included. Bad design there. The Diana shoots with the authority of a powder-burner, if that's your thing, but the ASP is smoother. I shot several 5-shot groups at 28 yards recently, using the second-rate Crossman pellets from Wal-Mart. I didn't anticipate anything to write home about, but with 6 groups, every one could be covered with a dime, and three of them could be covered with my shirt button !!! I'm still shaking my head on that one.