The optimum is a 99% dielectric one (see Bintel for example). There's no point in quartz or prisms - the difference between that and 100% is impossible to spot. Prisms use total internal reflection (100%) but suffer minor losses at each air-glass surface and add spherical aberration - which you don't need.
The point about the dielectric coatings is that they're tough, will survive cleaning and last you a lifetime.
Another issue is how these hold the eyepiece - in my experience the ones with compression rings do not play nice with eyepieces with undercuts on the barrel - the usual result being the eyepiece is tilted off-axis, or worse, hard to extract if the edge of the undercut catches on the compression ring.
I've just ordered a new one from APM with a fastlock which is a different mechanism to hold the eyepiece in position. see
https://www.apm-telescopes.de/en/opt...d-coating.html The Baader "Clicklock" is similar and others offer the same mechanism in various forms.