Not to revive a dying thread, but I have used both streaming services for the better half of the past year (even tried Amazon prime, actually), so I wanted to throw in my bit of experience with the streaming giants. I may not have a reputation on this forum, but I hope I can be somewhat helpful.
When it comes to the question of which service you might prefer, it really needs to be considered what content you value. Do you value a wider selection of movies and films? Do you prefer a much better selection, with much more recent updates, of full-length series and shows? If you prefer the former - Netflix it is, but I will warn that the selection of films is generally outdated, and as of late - I am very disappointed with the lack of any good updates to the selection. However, if you prefer the later - Hulu+ is a really good service for long-running series, and even the newest selection of tv shows.
In short, Netflix wins for the selection of movies, but all of those movies are generally outdated. Hulu+ wins by no competition for TV shows and more recent content.
If you want to get a bit more in depth, however, then let us discuss the user experience.
I have a Ruku HD. I play both services through this device. Hulu+ has recieved a bad reputation for their generally glitchy interface, and Netflix has recieved poor reviews on the UI overall. I want to reassure though: Hulu+ really seems to have improved! When I first began using the service, I found a displeasure in the amount of freeze-ups, lag, and crashes of the UI on the Roku. I imagine the situation was similar across devices. As of late (past 4 or 5 months), the problems have mostly disappeared. *Meaning, I have as much problems and glitches with Hulu+ as I do with Netflix - and that's usually due to a Roku mishap and not the actual services.*
For UI and user experience, despite past mishaps: Hulu+ just looks more modern, more polished, and much easier to use. (This is preference, but I find what I want to watch much more quickly on Hulu+ than I do on Netflix.)
Honestly, despite complaints of ADs on a paid service, I have no problem with this issue. Perhaps it was different in the past, but really? You have a 30 second advertisement at the beginning of an episode, and SOMETIMES (rarely) a 15-30 second advertisement in the middle of an episode. Really, given the short nature of these interruptions, there's hardly a noticed span of time. At the very least, for $8.00 a month, a couple of short, sweet advertisements thrown in the beginning and middle of an episode aren't bad at all.
For the record: I prefer Hulu+. Netflix has a terrible schedule of updates. I haven't seen a good addition to their selection for quite a while, and the content I want just isn't there. For the occassional indie film or foreign wonder, Netflix is great. Otherwise, it doesn't capture my attention. Apparently, I'm not the only one with such complaints. More and more people are becoming disatisfied with the content and selection of Netflix.
(Hope I helped someone a bit.)
** As for Amazon Prime: Generally, if you don't buy a lot of items from Amazon, the subscription isn't worth it. Free two-day shipping is a wonder... but I don't buy enough from amazon to justify it.**