Personally I think it boils down to:
1. The quality of your recording device - camera, lens, etc, and whether it can capture good 1080p footage. Some cameras capture 1080p, so the resolution is there, but the actual image quality is poor, so you maybe better off dropping to 720p but getting a better quality, sharper, image.
2. The capabilities of your editing machine with regards to rendering times. If you have a reasonably high spec machine and can put up with the wait during rendering, then why not?
3. Your upload speed due to the larger file size. Obviously full 1080p video produces larger file sizes, which need to be uploaded through the main bottleneck in the process - your upload speed.
3. Giving your viewers the choice between resolutions. Remember, quality is desirable over resolution - high resolution doesnt always mean better quality. Ensure the quality is still high at 1080p.