Hands down Apple products. They all work together well, last a good long time, and have good software coverage.
iPads are the best for those that just need the internet. The MacBook Air is good enough for the advanced stuff, and reasonably priced.
Roku is the one product that I don't think needs the Apple replacement. It is super simple to use, has a simple remote, was easy to tie into a sound system for them. They liked Roku so much that they replaced their older EOL TVs with Roku TVs. Also, I'll lump Sonos into this as they make a great sound product that easily connects to the TV and auto comes on, which is fantastic.