I've always thought that 5e was 100MHz and 5E was 350MHz. I was just checking my stock and found a cable box stamped as 5e but the cable itself stamped 5E. I am pretty sure that I have even seen 5e stamped at 350MHz. A distributor I spoke with just said the lower case e or capital E doesn't matter. Discussion?

Don't think it matters. You can get 5E in 100Mhz or higher.

I don't think the capitalization matters either. I would go with what is stamped on the cable jacket vs. the box anyway. It should specify mhz on the cable jacket (most of the brands I've worked with have it listed).

No difference

It was a Tipe O on the box

Enhanced is enhanced, capital or not.