Exchange vs CalDAV for calendar sync in iPhone 3.0

Now that iPhone supports CalDAV format for calendar syncing with the 3.0 software upgrade, which is the best method to sync your calendar with the iPhone ? I will present here the advantages and limitations of each method so that you can decide.

Exchange :
1. Exchange sync is fast (immediate)
2. Setup is easy (You only need to go through the setup once to sync all your calendars)
3. Once calendar setup is done, you can use the same account to sync contacts and mail easily
4. iPhone allows only one exchange account. So, if you already have an exchange account to sync your work mail etc and want to sync calendars with other account, you are out of luck
5. There is a limit for the number of calendars you can sync (example : only 5 calendars can be synced with Google Calendar)

CalDav :
1. Sync takes a little time
2. You have to setup an account for each of your calendars. So, if you have 5 calendars, you have to create 5 accounts on iPhone
3. Setup is a little tricky. Specially for the non-primary accounts (involves copying and pasting long URLs from the calendar service)
4. If you use CalDAV, you can use your one exchange account allowed to sync other things like mail or contacts
5. No limitation on number of accounts/calendars

Check this help guide from Google to sync your Google Calendar with your iPhone using Exchange.

Setting up CalDAV sync for Google Calendar with iPhone is a little tricky and I will explain the process in a separate post tomorrow.