While I have found that more expensive cables tend to have a bigger change in sound quality, I have not found that the change was consistently in a good direction. Better to have a cheap cable that is neutral than an expensive cable that is too dark.
Also, a lot of cables which emphasize sound stage do so by darkening the overall sound.
Crimped/cold welded connections > screws > solder
There’s a reason why your 200A home panel is not soldered!
I don’t know if silver measures better, but using simple silver wire IC’s got me 100% off the cable merry-go-round.