We have found iPhones 3GS/4 running iOS4 on AT&T to be the most reliable with ActiveSync, as well as DAV for shared items.
Later Blackberry models with AstraSync software also work well.
The Droid market is a mess; different carriers cripple the OS in different ways and all of the phones get frequent firmware updates which alternatively fix bugs and introduce new regressions. We had two identical Droid phones from different carriers; one worked fine the other wouldn't sync at all.
Windows Mobile we have found to be problematic with frequent software hangs.
Hope that helps,
Mark
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___________________________________ L. Mark Stone, CIO "Uptime. All the time."
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