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#11
Win 10 is up to you. Personally I like it and what I have.
I would first make a complete drive back up (disc image) of all partitions to a separate (USB connected or internal) drive. Then if things go bad or you don't like Win 10 you can restore back to Win 7. You should be making periodic full drive backups anyway - not for IF its ever needed but for WHEN its needed. The free and popular Macrium Reflect (what I use) is suggested for a disc image program.
Macrium Software | Macrium Reflect Free