i have lived in both. although i like clearwater bay and sai kung(where we now live) i REALLY miss DB.
yes, there are pre-schools in clearwater bay, but not much else. you have to travel to do anything, get anywhere.
i REALLY, REALLY, REALLY miss the community feeling of DB. it is really like a small town, everyone knows everyone and people keep an eye out for one another. there is no need to "arrange" playdates, a trip out to the nearest playground suffices. there is always someone up for a chat in the plaza, the supermarket is right there as are all of your other daily essentials. central is a lovely ferry-ride away, there is no getting stuck in traffic on the way to work. you get your down-time built right into the day. i never found the ferry to be a hassle, it's just like catching a bus, if you know what time it leaves, you just make allowances for it.
there is a sense of community in CWB and SK, but it just doesn't measure up to the feeling i had in db. if it were up to me and money wasn't an issue, i would be back in db in a heart beat.