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I tend to prefer lowercase since it reduces the number of confusable characters, especially in handwriting (8/B, 0/D, 4/A), but I can understand that numbers might typographically or semantically feel uppercase, so lowercase A-F creates a MIxEd cASe looK.

Is uppercase the older tradition? I'm ~30yo and I've been seeing both for as long as I remember.

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In my experience, it was always upper case until around the time CSS was introduced. The article pictured has it in upper case and it's from 1968.

HTML was as well, before CSS became commonplace. I still reflexively do it on occasion when writing a root page (html/head/title/body tags).

Most hardware was upper-case-only until the '60s — being descended from upper-case-only accounting cards and/or teleprinters.

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