What type of opinion are you looking for? Its hard to say based on what your needs are.
They both can use the 3G network, both have a 2.0 mega pixel camera, full keyboard.
It doesn't specify the size of the screen on the Moto Q and it doesn't specify expandable memory on the Blackjack.
If you a extreme power use you may want to look at the Tilt. I've had mine for a little over a month now and with some 3rd party app's installed I love it.
Without weighing what you want the phone for I would go with the Moto Q based on looks.