User blog comment:Linathan/Unit Spotlight: Sylvan Excalibur Quaid/@comment-26336535-20150508000251

I'm not sure if you took note of this, but the BB parts of his LS are more effective than Are's Excelsior and Supreme Ruler's Magic. Since there is the 30% boost, you get a nice fill buff. But then there is the 20% decrease in BB gauge. Assuming you have a BB that requires 65 BC to fill, the fill rate buff alone would require you to take 50 BC to fill that gauge. With the 20% shrink, without the fill rate buff, the Gauge size is 52. After the fill rate buff combined with this, you would need 40 BC to fill up the gauge. Are's excelsior on its own would require you to obtain about 49 BC to fill up the gauge, and Supreme Ruler's magic would have the same effect.

In addition, there's the added advantage that BB buffs like Zelnite's, Kuhla's, and Shida's are given more effectiveness due to the actual reduction in the gauge instead of pure fill rate buff like Are's Excelsior.

In percentage (Dual Leads):

Are's Excelsior: overall efficiency boost: 2X speed (but BB buffs are left unaffected)

Supreme Ruler's Magic: also 2X speed, as the gauge is reduced by half altogether

Quiad: Gauge is shrunk to 60% of normal size, and BC is 1.6X more effective. I think that equates to 2.6666... times efficiency.