Android OS has best flexibility and most convenient because there are many different proggy (NNG, Sygic, Navigon, Garmin, Waze, etc...) that can run on it. Then WinCE is next. Dedicated PNA from Garmin, Navigon, TomTom will only run their own proggy. NNG is most/easiest to hack/mod. NNG and Sygic can use both HERE and TomTom contents. Garmin has best non-TTS voice features while NNG has most flexible TTS voices (it can use android, Loquendo, Nuance, etc...) Regarding speedcam, NNG .spc are directional as well as Cyclops for Garmin. I think speedcam from Sygic is also directional. Regarding OSM data, Sygic and Garmin have access to it. NNG online contents also are better with some proggy able to access Weather, Parking, Search, etc... Sygic has worst stability with problem in pretty much with any new update. I've heard good thing about CoPilot but unless recently changed, you can't download map per states (has to be entire US or NA) Same with Garmin and TomTom map data, but at least with Garmin you could create your own map that is a subset of it.
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