F1TV is your best bet – when it works. As most online platforms, there's the occasional but super frustrating hiccup. Take our sage advice and remember: the mobile apps usually work better than the web player.
Apart from that, F1 TV is great. The onboards with radio are super nice to have, and you'll easily get addicted to it. You'll also be able to watch the support series, so hey!
If you could pick only one track to visit in your life, it's this one.