In my experience(s), it doesn't matter much if the 10 hp has solid or rubber mounts. The 12 hp needs rubber a little more so. The 14/16 hp engines will vibrate pretty bad without the rubber. That's in a QL tractor. I've known the rubber mounts to last a long time in a 10 hp tractor. Maybe only 5-6 years with the bigger engines.
I don't know if the engines I've had experience with had balance gears in them or not. Never looked.
That said, I doubt if you'll get ANY vibration dampening out of the polyurethene mounts.
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