how about this: You figure it out. Experiment to see what works for you. You dont really need advice that you wont listen to until you find out the hard way. So, just experiment. Do a sybil, and then do a quick effect with a normal double lift. Then go to another audience and DONT do a sybil, and do a flourishy Double lift like the diving board double, and study those reactions. Its jus a rough experiment though, you decide what you want to do. Study and record those reactions, and see which one is better.
Just remember, you can get advice on magic theory anyday, but until you get out there and study it for yourself, you will never understand what people are talking about.