If you think it can still handle Windows 10, then try installing W10. You can debloat it afterwards to remove unnecessary items. Or install a custom or "lite" W10, like Ghost Spectre.
Windows 7 (or XP) isn't recommended (especially if you still plan to use it online/internet) but it would be your fallback (for Windows) if you don't like W10. There are also custom or "lite" versions available if your hardware is really really old.
If you want to try something other than Windows, then try Linux.
If you think it can still handle Windows 10, then try installing W10. You can debloat it afterwards to remove unnecessary items. Or install a custom or "lite" W10, like Ghost Spectre.
Windows 7 (or XP) isn't recommended (especially if you still plan to use it online/internet) but it would be your fallback (for Windows) if you don't like W10. There are also custom or "lite" versions available if your hardware is really really old.
If you want to try something other than Windows, then try Linux.
If you're thinking of using W8.1, then it would be better for you to just use W10. Do a clean W10 install then debloat. Or you could skip all that and install a custom or "lite" W10—like W10 Ghost Spectre.