Should I run the same front and rear tires for a full mountain setup?

I just replaced my rear tire since it was very worn and not providing adequate traction.

So the rear is now some very knobby Specialized chunky thing. And the front is now a slightly worn Bontrager with a very different tread and narrower width.

Should I go with the same tire up front or is it better to run something slightly less aggressive up front?

Thanks in advance folks.