It all has to do mostly with the dog bone. If you have a stick shift you will probably will feel little difference between rubber and poly. BUT: If you use poly mounts you have to use an adjustable poly dog bone. Once the engine and trans is in it will not move and the dog bone has to be adjustable so it can be set to the correct length. If you use poly mounts and a rubber dog bone you will probably ruin the poly mounts over time or have some steel break or something.
I had poly in my 88 Mera back when it was an automatic. The only time you feel the vibrations is when you have it in drive and are at a dead stop. Once you start moving you do not feel anything. I was disappointed to loose that vibration feel when I went to a stick shift. I even went to a solid dog bone. Nothing.
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