The key thing that people need to remember is Lagat is a racer. Galen has as a Silver. Lagat has multiple INDOOR 3k GOLDS, outdoor golds, silver, and bronzes. Championship racing is about position and kick and Lagat has proven he has what it takes. He is a great tactician. I would take a 7:38 Lagat in a kickers race over a 7:34 Rupp.
Say Rupp does run 3:48 in Boston, where does he go from there? How does he hold this peak of his career through USA's and World's? Lagat on the other hand is setting his season up to perform when it matters and that is USA's and World's. Remember when webb ran 3:46, he was in peak form and worthless by the time world's showed up. Its impossible it hold a peak at that level for that long. And a time trial type race doesn't indicate kicking speed or ability to put yourself in good position.
In the end Lagat will be better prepared and set his season up well to perform best at USA's and World's.
RUPP= Faster SB's and Records
LAGAT= Race savvy and world indoor medalist
I would rather have the records because thats what gets you paid and name recognition but, Lagat will be the better race in the end.