6 Ruby Orbs vs 6 Sup Runes of the Scholar?
There have been a bunch of threads on the subject but basically yes, go with the orbs.
The other thing to look at is your HP. How often do you actually meet the >90% requirement?
If you’re amazing (and not a Shatter Mesmer), then use Scholar Runes. If you’re not amazing (or a non-Shatter Mesmer), use the Ruby Orbs.
Why the hate/love for Shatter Mesmers? They’re the only build on Mesmer that benefits from Scholar Runes. The other builds will all just be wasting runes.
The typical results that I see espoused on forums is the following:
Scholar runes do 7.5% more damage than ruby orbs when your health is above 90%.
Scholar runes do 2.5% less damage than ruby orbs when your health is below 90%.
If you are above 90% health 25% of the time, you will deal more damage with scholar runes than ruby orbs.
I have not run these numbers myself but I trust many of the users who have vetted the results themselves.
I put scholar runes on my ranger. she tends to stay out of trouble, so full health most of the time.
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The trick with Ruby Orbs vs Scholar runes is it depends. Where your Crit Damage and Crit Chance are before adding the upgrades can make a difference on which is better.
If you have quite a low crit chance beforehand, you likely should use something else. However, the scholar runes will do better for you since they add more power along with the +10% damage (if your health is over 90% a lot).
On the other hand, if you have low power and high crit chance, the ruby orbs are likely to be more useful as they add more crit damage and that 10% bonus is less attractive.
Just some thoughts, but in short, look at your build and run the numbers.