I don't think any of these devices will eliminate vibration. Some may be more effective than others. I experimented with spikes, pads, wood blocks and have found they pale in comparison to a proper vibration isolation platform like the Vibraplane system. There is simply no comparison, but as Albert points out, it is much more expensive.
Best T/T Pods/ wood blocks to eliminate vibrations
My table is 3 feet from the right speaker. When the tonearm is in play, knocking on the table plinth or dust cover creates an amplified thumping sound. The table is a Rega P3-24 and has THREE rubber cone feet that are not removable (There are two in the front and one support in the middle at the back of the T/T. The table sounds good, but I know that feedback is degrading the sound. Need recommendations for either footers, pods, points, or blocks to eliminate that thumping sound. BTW, I can not use a wall shelf because the walls are concrete, and also cannot be drilled