The best arrangement I have used is what Harken refers to as a two speed system, see examples 11-15 at Harken Mainsheet Trimming Systems
Basically the sheet is double-ended, but both ends come thru a pair of sistered camcleats. So you can fine tune with power by trinmming just one sheet, or trim or ease fast by handling both. Trimming both is no more difficult than a single sheet.
The system IMHO provides the best single solution for both power and speed.