I would agree with Tikker.
Generally in the long run, the ATV4 is your best option.. though may have some issues initially, depending on services needed.
- Your apple TV purchases (movies, TV, etc) yes you can stream directly from the net on it.
IF you have them downloaded on a PC with itunes, and have homesharing on, you can stream them from there if you want (save internet usage if its an issue).
- I agree for your LOCAL content, PLEX would be the best choice. Your NAS should have the ability to install the PLEX server application on it. It will give you a more netflix type interface (with episode info, watched/unwatched, etc) for your home stuff.. vs say the basic DLNA file list interfaces. The ATV4 now has a full plex application for playback.
- Netflix is no issue on the ATV. For the sports.. i know there is the GCL for NHL, and the MLB apps (at least on the ATV3). Not positive on NFL though, may be more apps on the ATV4. These will all require separate subscriptions to their services.
The ATV4 right now though, for the OTHER services like CRAVE and SHOMI, don't have a proper app yet. (with the OS change on the ATV4.. they havent made it yet) These are present on the ATV3... BUT the ATV3 doesnt have a Plex interface.
That being said.. both of them do support AIRPLAY.
I have plex server at home, both my basement and living room PCs have apps which can directly access it. My TV in the bedroom does not. I have the ATV3 up there. If i want to use plex... i just stream it from my phone/tablet via AIRPLAY.
As for Shomi/Crave... its just like any other.. its all dependent on WHAT you want to watch.
There are many who have said X service is crap, there is nothing to watch. Really, its personal opinion. I have watched a fair number of stuff on Shomi myself.. but may be stuff that others dont like/want to watch. (there is a TON of kids programming).
So really need to try and investigate if either of them would have content you wish.
(may be worth looking at too, when you are looking at your internet.. check the bigger providers as well.. Depending on the speed package and usage.. some of them at the higher/faster end are really in the same range.. and SOME of them may include free SHOMI or GCL (or similar) with getting it.)
Rogers Ignite Xi6, LG 47LV5400 LED TV, Yamaha