Whether or not they beat them in videos is very much a matter of subjective preference for the videos one has that the other does not; if someone says they do in explanation of a personal decision, you need unusually personal information to argue that they are incorrect.
> Amazon Prime has around 18k titles to Netflix's 4k titles.
As most people won't watch a significant fraction of either, the counts are mostly irrelevant in deciding which wins for any individual; what matters most is who has more of the usually very small number of titles for which the individual has a strong preference; everything else ends up being mostly noise in the menus, more likely to be a cost (unless masked by personalization) than a benefit.
I'd been meaning to cancel, actually, and this reminded me to. Looks like they already got me for a year a couple months ago, but I've got a reminder set to cancel next time. It's really, really not worth it.