One advantage Priv has over BB10 devices for Gmail
One advantage the Priv will have over BB10 devices is better email synchronization with Gmail. Unless you are paying for a Gmail email address, the synch between BB10 and Gmail lags. New email messages come instantly, but the synch between read and unread is at least a 5 minute delay (i think).
For example - I'm on my PC, I view an unread Gmail email on my PC because I see the red light indicator on the Blackberry device. There is a lag between the unread email showing as "read" on my device. It's not a huge deal, but I used to hate having the indicator blink and have to go into the hub to stop the light from blinking. With the Priv, based on Android, that synch will be instantaneous.
Small perk, but it's easy to get used to.