If you occasionally have long periods - say, an hour on longer - times of inactivity during the day, why not use sleep mode?
I'll be happy to answer your question, but prefer not to start a discussion about it in someone else's thread.
1) Neither Hibernation nor Sleep were 100% perfected by Microsoft. By that I mean that neither is universally compatible with all hardware and software configurations (nor, realistically, can they be). Hence the relatively common and varied issues posted on support forums about problems with both features.
2) As I mentioned above, powering down the hd & display serves the purpose of saving wear and tear on both with the added benefit of reducing power consumption. It also serves my purpose 100%.
3) Given the size of today's hd's it's not as important today as it once was for most of us, but hibernation writes a very large file on the system drive.
4) Personal preference.