VPI Magic Brick or Webster's Dictionary

I have the VPI bricks and the best part about them is giving them to a friend seeing the system for the first time. Watching them almost drop the small brick because of its weight is worth owning them. Watching the expression when explaining the brick's function is also funny...usually one of "you're kidding me, right?" I've tried it on transformers and not and can't tell the difference. But you be the judge.

i've toyed with different weight tweaks-sand bags,brass,lead etc.
and found NON MAGNETIC stainless steel blocks(tool grade) works the best for me.
i currently have true carbon cubes as isolation footers under my cdp
ahhh, to be friends with toolmakers

Try scuba belt weights. They are lead blocks coated with heavy "soft" plastic material -- and very cheap. They generally come in 1, 3, and 5 pound sizes and are relatively small for the weight. VERY dense!

I owned a preamp for many years that actually recommended the VPI Brick right in the owners manual. It even told where exactly to place it. It did quiet things slightly. This preamp has a built phono stage, so along with the power supply there was a lot going on inside.

I have gone the cheap route with some gear (bag of sand or lead shot).

I have read reviews elsewhere and seen people here claim the Shun Mook Mpingo (wood) discs work.....seems incredible if true since they are not very heavy and apparantly somehow "tune" vibrations. (of course they are not cheap!)

I do use some cheap Mapleshade Heavy Hats which are brass discs in two sizes you place on top of gear to control vibration, the benefits if any seem to be small.

In general I don't see much mass loading of gear used now, since there are many advanced vibration management
systems.......Aurios, Sistrum etc. which seem to be very effective.

To answer your specific question I would use neither of the two objects you are inquiring about.