You are not the first person to ask about water filters, so there are hundreds of posts here about them including all the ones you mentioned. Use the search function, set it for a year or two and you should get more info than you can read in a week.

There are also dozens of websites on water treatment in general to give you a background as to the differences in mechanical filters and purifiers (there is a difference).
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Don't get me started, you know how I get.