Pay to play. You can cough up for premium versions of all services mentioned. Or get used to stinkin’ commercials. Or enjoy silence.
One streamer plays Pandora radio stations commercial free - no charge.
Features are a bigger difference in streamers than SQ, Examples: Aurender doesn’t play with Roon; PS Audio and Metrum will not play local (USB) a non starter for me, some that do allow internal SSDs (Aurender, HiFi Rose), most are external only.
Capacitors? Red herring. Cost is ridiculous for any perceived improvements.
A $25 wifi extender has a better BT receiver than mostly streamers feature and gives you rock solid Ethernet.