NVMe M.2 SSD Gen3 vs Gen4 - real world performance?

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I've read that real world performance between Gen3 and Gen4 NVMe drivers differs very little and most users can barely tell any difference.

Can anyone confirm this please? If possible I'd like to save a few £ on my new build by going with a Gen3 drive rather than Gen4.

Also, what would be a reasonable size for an M.2 boot drive? It will have Windows plus a few additional applications installed. I'm leaning towards 500GB.

Thanks for advice.

 

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Thanks all, much appreciated.

Will probably go for a 500GB Gen3 NVMe drive to keep the costs down and reuse a SATA SSD I already have for general storage.