I was somewhat kidding around but in general I prefer fixed grips cause they're cheaper and more reliable, as evidenced by the super Chiefs problems. If it is just a beginner lift, you can run it slow but if it is for mixed terrain with a long line then running it slow is just torture for everybody. So my reasoning is to install a good, reliable, economical lift, teach the employees how to run it efficiently (including stuffing in the shitty skiers) and just lit 'er rip.
Detachable lifts, fan guns and other high tech stuff like that... It's all great but complexity decreases reliability and increases costs which drives up ticket prices.
Keep it cheap, don't baby the newbies, run the lifts full speed.
"You want your skis? Go get 'em!" -W. Miller