We bought one from chungwa previously but they have discontinued them.
i bought the xiaomi one for my kids, it works very well.
only issue is whether you mind the data being sent to China 
Fitbit?
my kids have them. they like theirs. They have Strava accounts linked up, so can track all their walking and biking.
But does fitbit make calls/send messages?
Similar discussion happening here:
Fitbit can only receive texts
Apple watch can receive/send.
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They have a selection. But I have no experience with his company.
We contacted the company that previously supplied Chung wa. We wanted the youngest to have the same watch as Big Sis.
They directed us to the company that was dealing with their leftover stock.
All ex demo watches except for one which was in an unopened box.
Bought it. Not cheap 6900.
On the plus side. One app. The kids can play games/compete on steps with each other etc.
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