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I'm starting to use bbm more than whatsapp now
What I like:
- true read receipt(whatsapp only means it sent to device)
- fast even with gprs
- powerful group feature: administer, lists, event

What I find lacking:
- design language should follow ios7
- manage notification for group. I need to mute some group if it's too noisy or active
- suggestion to found people I know that already use bbm so I don't need blindly send invites to all my contacts
 
I think BBM is rubbish, very basic features.

I might be a minority but i think Whatsapp is by far the best messaging app.

It just needs updating to IOS7, although i won't hold my breath.
 
Tango currently triumphs Whatsapp and BBM in terms of features and design. But I'll always choose BBM over Whatsapp.
 
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