I currently have a VH Audio Airsine powering my orig Hydra which was a major step up from the supplied PC for the Hydra which I've been told was comparable to a Shunyata Sidewinder.
I also own a Shunyata Sidewinder and have compared it to a Flavor 4 with gold Wattgates on both my CDP and my preamp. In both cases, I liked the Flavor 4 better. The differences were subtle but definitely there. I'm not sure how the Sidewinder and Diamondback compare but I think the Sidewinder is/was a bit more expensive.
IMO, unless you're willing to spend major $$, it's hard to beat the VH Audio PCs.
I also own a Shunyata Sidewinder and have compared it to a Flavor 4 with gold Wattgates on both my CDP and my preamp. In both cases, I liked the Flavor 4 better. The differences were subtle but definitely there. I'm not sure how the Sidewinder and Diamondback compare but I think the Sidewinder is/was a bit more expensive.
IMO, unless you're willing to spend major $$, it's hard to beat the VH Audio PCs.