I would definitely use the ASCII versions.
Why? It's less readable. I like how JetBrains in recent releases renders ">=" as a single glyph. I mean maybe for typing, I see that as a benefit, but I'd hope my IDE would replace them with the proper Unicode character.
Something to note is that there are ASCII equivalents[0] for every cool Unicode operator found in Raku. For example, the equivalents for ∈, ∉, ∋, ∌ are (elem), !(elem), (cont), !(cont).
[0] https://docs.raku.org/language/unicode_ascii#Other_acceptabl...