Don't Buy a Cheap Apple Watch Series 3
Don't buy an Apple Watch Series 3. Many recent articles enthuse about its current wonderfully low prices, but it's a trap. The Series 3 is slow, technologically obsolete, and unsupported by the upcoming watchOS 9. Anyone buying it as their first Apple Watch will be disappointed by the awful performance.
I could only recommend it for someone who broke their newer Apple Watch, wants something to tide them over until the new Series 8 is released, and can recycle it or donate it to someone who'd be OK with a dead-end device.