Cox internet

Streaming video doesn't need all that much bandwidth, about 5mbps per HD stream and maybe 20mbps per 4k stream. You could watch 8 HD streams at once on the 100mbps plan and have headroom. On the 250mbps plan you could watch 8 4k streams at once which no one ever does. Cox's comparison page makes it out like you need 500mbps because it's "great for 4k video" but you can watch 4k on 3 or 4 TVs at the same time on the 100mbps plan and not notice a difference.

You'll notice the difference when downloading large files and that's about it. Like a playstation game that's a few 10s of gigs.

Unless you do something out of the ordinary then 100mbps should be plenty, or you could go with 250mbps if you feel the need. I would probably go with 250 mainly because they bump the upstream speed from 5 to 10mbps. Upload speed matters more than most realize, especially if you have any cameras that save to the cloud.

I would also recommend shoving their "panoramic wifi" equipment up their arse. They'll charge you like $12/mo for it forever. Better off buying your own modem and router.