HDMI or Displayport
If you're using a TV which only has HDMI, then there's no difference. A DisplayPort to HDMI adapter will just output plain HDMI signals, you won't get any benefits of DisplayPort unless it's an end-to-end DP connection.
Most TVs are only capable of showing 60 individual frames per second. Even "120Hz" or "240Hz" TVs are only 60Hz in reality in most cases. Unless you get a 120/144Hz monitor you won't be seeing over 60fps in anything.
1. Yes, they are different shapes and aren't interchangeable
2. HDMI cables don't have revisions, and neither do DisplayPort cables.
3. DisplayPort is "better" in the sense that it supports higher configurations, it has higher bandwidth to support higher resolutions and refresh frequencies, but it doesn't really matter. In configurations that they can both support, like 1080p 60Hz, they're both identical. In higher configurations like 4K 60Hz, DisplayPort is your only option (pre HDMI 2.0, which most 4K displays still are) so it doesn't really matter anyway.
4. Like I said, DisplayPort to HDMI cables will limit you to the limits of HDMI, sending HDMI signals from a DisplayPort output won't magically give you capabilities beyond the HDMI specification.
5. Depends on the TV, although in general TVs have higher latency than monitors.
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