I'm a relative newbie.

I've just finished my labour of love - 200 mobile phone video and audio clips of 43 kids = 14 minute digital nativity (COVID restrictions in my country mean no Sunday School since March).

I want to render it for youtube in as high quality (?lossless) as possible, as I'm hoping it will be well watched over the years to come by our families.
Should it be a 4k WebM-VP9 or H2.64

And I'm really praying that we NEVER have to do this again!