That's the only difference. On a performance basis, a moving mirror will TYPICALLY be faster than a moving
yoke, because there's a lot less weight to move in a mirror. However, the range of coverage for a moving
yoke is much greater. Older moving mirrors could only pan about 165 degrees, and tilt about 110. Newer moving yokes can
cover 540 degrees of pan in about 2.5 seconds, which is pretty fast. Still not as fast as a moving mirror, but nothing is perfect.
And don't get too excited about not having access to a lot of moving yokes. the more sophisticated the equipment, the more likely something will be broken.
Not a single show goes by where there's some minor glitch I have to deal with. Sometimes, it's very minor. Last Saturday, one
fixture kept coming up with a head temperature error. Fortunately, we were near the shop to get replacements. But several fixes later, same error on 2 other replacements. Turns out, it was just too damn hot in the
venue and a box fan directly behind the one
unit (which had to be near an air conditioning
return) solved the problem.