IMO the latest Win-10 21H2 without a question and/or doubt, worst 3.0, ME and Vista but and yes allot will say XP or Win-7 are the best but in my opinion they are ancient no where near the efficiency/simplicity of the streamlined OS like Win-10 that works 100% and great on even 10 + year old desktops and laptops Then we come to this new Win-1121H2 (which I’m using now and is the same as Win-10 21H2 and works great) mind you I had to get a new PC as it will get there but its no different to Win-10 21H2. The only negative with Win-11 is its compatibilities issues like TPM Trusted Platform Module version 2.0 mobos and its limited CPU’s which are the biggest big negatives against it as the mass consumers can’t use this OS! Hence and why these changes restrict it from being in “The Best Windows Category”.