High quality content

[DeanoVIP]

Is it better to have a media file with different variations of conent. For example, 720p, 1080p and 4k?  Most of my TVs are 1080p but I do plan to upgrade one or two of them to 4k.

I was unsure whether it's better to just have the highest quality and let it transcode, or to have a variety.  I do actually have one TV on WiFi that signal is not the best so 720p seems to work better, assuming it's smaller to send.