I would definitely say VLC because just about everyone and their grandma knows about and probably use VLC on their computers/laptop even if they’re not tech savvy. It’s easy to download and install on windows, making it more accessible than Linux to the average computer user. Linux is definitely more impressive, but is used by way less people and is still mostly used in servers.

Edit:

I’m not including Android in the Linux count because I’m talking straight computer/laptop and not mobile devices. Don’t know how many people would bother with VLC on android. I know I don’t because I don’t need it on my phone.