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Engine mounts are designed as a compromise, just like most components on a street car.
The greater the mount's ability to dampen vibration in the cabin, the more the engine is moving around under lateral acceleration or cornering loads, although the ride is comfortable.
If the mount is made solid, the engine doesn't move and therefore the car handles better at turn-in, less torque is lost lifting the motor under hard acceleration and gear change under heavy acceleration feels more precise. Downside is of course a harsher ride.
The decision really comes down to how hard you drive your car and what tolerance you have for vibration. The issue of the part's longevity is really secondary.
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