For the price range i would stick with android. If the price was not a factor then windows surface pro.
Both OS' are good for basic tasks. But if you are a real power user, I would prefer a Windows Surface.
Depends on what ya gonna use it for. When using photoshop or video editing I use a windows machine. Android tablet just for quick surfing , social media , and the kids use it to play games on it
Windows Surface is best windows tablet but it's not cheap, if you have the money then buy that if not a android tablet is best choice for what you can get priced wise