The differences will likely rely on personal design preferences, availability and price, all things that are not inherently related to how a phone is built. (9to5google.com)
For one thing, most of the watches are all quite similar in software and hardware, leaving design preferences as the biggest factor. (androidauthority.com)
Sometimes saving money means that you have to sacrifice certain design preferences in order to stay on budget. (earlymomentsmatter.org)