Honestly, I’d prefer leisurely delivery unless next-day is absolutely necessary (and it should cost extra). Biggest problem is overpromising, just say it’ll take 3-4 days and people will be happy it arrives in 2. It’ll give the delivery workers a break, and you probably don’t need it by tomorrow anyways otherwise you should’ve ordered sooner.
Part of the problem is the lack of stores nearby in case you do need something right away of course. Ideally you could solve that with a quick corner store visit instead of having to order online.
Basically Amazon didn’t just fuck up retail, but postal too.
This is the most thorough answer I managed to find so far. They do mention silver being more valuable, but seems like the application process might be more expensive also.
The only source I could find on commonality is this paywalled market report claiming “The market is segmented by application (home and commercial) and type (aluminized and silvered glass mirrors), with silvered glass mirrors currently holding a larger market share due to their superior reflectivity and clarity.” Not sure whether greater market share necessarily means more individual mirrors produced though. But sounds like silver still reigns supreme despite higher costs, though not sure by how much.