What's the best system now? Clean, reliable image download site, please.

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Previously used JujuMao, feeling too many ads, thus didn't use it anymore.
X8x6, feeling the author won't compress system files to 12GB+ or more, which is too big for me.
Used to be pure and I also tried it but forgot about it due to reasons unknown
IceFen has been using lately, downloaded his Win10 Old Chive. The CPU utilization rate at standby mode was only 15%. Too unbelievable!