Tray shuffling would be the most efficient in terms of the number of sheets you can do at one time, although this is a technique that requires testing and practice. Another alternative if you have 16x20 trays is to make yourself a "slosher" which should be able to accomodate 6-8 sheets of 4x5 film. It is a relatively easy, flexible way to get nice, even development, and eliminates some of the risks associated with hand shuffling (eg scratches). The downside of course is it is not a daylight process.