I use both Hulu and Netflix (as well as Amazon Prime). The Criterion titles are certainly on of Hulu's highlights. Hulu also offers some television shows starting the day after they have been first aired as well as television content that Netflix does not necessarily have (the British show Misfits, for example). Hulu also has commercial interruptions for the new TV content, though the commercial breaks are shorter than OTA length.
Each has gaps in content. FWIW, I end up watching Netflix more frequently, but I've found some real gems on Hulu. It's definitely worth at least the free trial to see if you'd like to switch or even use both services.
It's worth noting that some of the Criterion titles available on Hulu are not available on Blu-Ray or DVD, too. If you enjoy those, you may also like some of Hulu's other eclectic programming.
Both services' interfaces could be improved, IMO.