Needs more space: For a given space, metal springs will generally offer improved vibration absorption when compared to a rubber solution.
Rubber works well in compression and shear (if Engineered properly). Due to something called ‘hysteresis’, internal friction in the rubber absorbs energy and therefore brings oscillations to rest faster than would otherwise be the case. Built in damping: Rubber is essentially your spring and damper in one convenient package. Once the product has been designed and mould tools manufactured, rubber offers great value for money. Cost: Rubber is probably the most common material that we see and use for AV mounts, for good reason. We will publish another article on rubber compounds in case you want to know more about this, but for now, we will refer to generic rubber based mounts. Rubber is a generic category title, there are lots of different rubber types, some of which lend themselves to vibration absorption, some not so much. Rubber AV Mounts (often called Silentblocs): I am not an industry expert in foams, our key industry is in Rubber, wire rope and springs. *Whilst rubber can do a good job at both vibration and shock isolation, one product in is unlikely to be able to achieve both for the same application. Summary of Vibration Absorption Media Strengths and Weaknesses: This article aims to tackle some basic differences and similarities between mounts based on these materials (there are other materials, but these are the main ones). 
Here is my view after many years in the industry. If, like me, you grew up wondering what the answer to this question was, relax. This is a common question, there are a wide variety of vibration absorbing mounts out there based on different materials – rubber/elastomers, metal (e.g. Should I use rubber, springs or wire ropes for anti vibration mounts
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