IME, DigitalOcean performance is usually a little lower than Linode, but some zones seem(ed) to be particularly bad. However, on the zones I do use, reliability on DO in 2016 has been the best of the three. I can hardly remember any outage at all.

Edit: Vultr has been reliable as well, but I've experienced a few outages (not lasting many minutes I think) in the 6 months I've been using them.