OWN all the way!

Unless you're subscribed to some of their fastest tiers, buy something cheap. I used to use the Motorola SB6141 modems, but have had too many failures with them. I've since switched to the ultra-cheap TP-Link modems. Better signal performance, cheap, and I bought it with a Citi card so an extra 2 year warranty on top of the manufacturer's 2 year warranty. I'll probably be ready for a different modem in 4 years and if it dies before then, it's covered.

Not wanting to sound like a shill or fanboy, but TP-Link's Archer C7 router has a great range on it. I also have an Asus router at another one of my homes and happy with it. The Asus is a bit more featured than the TP-Link, but it also cost almost double.