Lord engine mounts are built by Parker Hannifin and comes with a 5 year warranty.
Barry engine mount are built by Hutchinson and comes with a 5 year warranty.
Vibration isolators are normally tested and approved to the environmental tests appearing in MIL-STD-810 or MIL-E-5400.
They may be used in a temperature range of -65°F to +300°F (-54°C to +149°C) for BTR® Silicone and -40°F to +300°F (-40°C to +149°C) for BTR® II Silicone.
In general aviation, Minimum Performance Standards is what FAA require to certify a product.
Is there a difference, other than the price, between Barry or Lord ? I don´t know.
In general, mounts that are intended for aerobatics are stiffer and will cause more vibrations in the aircraft.
Good luck