Conclusion of this thread.
There is really no big life changing difference one way or the other with Windows 7 and 8.1.
If you have Windows 7... be happy and carry on.
If you buy or build a new computer you might as well go with Windows 8.1.
It's cheaper than comparable versions of W7, and no animals will be killed in the process.
You will be a little more future proof as well.
I'm am so glad Jim chimed in to re confirm this for me. Jim I trust 100%. The rest of you,,, well depends...:)