I just realized how awkward that sounds...
But what hardware? And what services? And what mainly do you watch, if it's different from the sort of things you'd watch on broadcast TV or cable?
I'm just curious, because I've been using an Apple TV for the last few years, ever since I dumped my old broadband provider and streaming Internet video became a viable thing. I don't expect I'll try a different box, but I have been impressed by the variety of services on the Roku and Amazon Fire. And the Fire's gaming capabilities are intriguing, even though so far it just looks like Ouya/Gamestick-level Android games.
Apple TV, Second generation (2010). Subscriptions: Netflix, Hulu, also some cable channels. I'm also pretty much locked into the iTunes ecosystem at this point — I've definitely reached the "I was born a snake handler, and I'll die a snake handler" period of our relationship.
I get Amazon Prime on my other devices but I've never really liked streaming via game consoles. Apple won't let Amazon have an Apple TV channel, so I have to use AirPlay, which can get awkward. On the whole, though, I haven't really bought anything through Amazon's digital services beyond a couple of dozen physical CDs whose contents are now available through their music services, so it's not a big deal.
Generally speaking, I find Netflix's selection of "first run" movies to be pretty lousy, but I've found a lot of gems under the surface. The TV selection, especially original content and British shows, is pretty solid. Hulu is worth subscribing to because it's got about 80% of the Criterion Collection online, all in HD, including movies that haven't been released yet. And I watch a ton of YouTube stuff as well.