Originally posted by Chris Orndorff: We're all pondering what exactly you're asking.
I've owned both SIG P226 and P229 with .357 SIG barrels but without any info or criteria provided by the O.P. there is no way to provide any meaningful answer to such an ambiguous question, so I held off replying as well.
schrack, garbage in garbage out...if you would like informed answers to questions you need to provide more information when asking the questions.
If achieving the highest velocity possible is your goal then, as sigfreund pointed out in his post, the longer barrel of the P226 will generally produce higher velocities, although I would suspect that, given the barrel lengths between the two are so close, that any velocity gains in the P226 would be marginal.