Which motor mount tends to fail more often?

Got a varying idle drivetrain shake/roughness that at 115K miles I am pretty sure it is a mount. Are any one of the mounts/restraints more likely / more common to fail than the others? Just doing some homework before I get under there. Thx.
 
Generally from owning ALOT of other Mazda's, the rear mount generally is the 1st to go. Ive never had a side mount actually fail on any of my Mazda's.
 
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