For my older kids (now 8 and 6) I have just my name and complete cell phone on the front and DH's info on the back.
For the boy, now 3, I have his complete name on the front and my first name and complete cell phone AND Dh's first name and complete cell phone on the back (It all fit on the Jr sized band).
You can't see the info from a distance, so whatever you put on them it totally up to you. I just figured that our home number would be useless, and since the boy is just 3, he may be hard to understand by others so his name was important.
HTH