Light-Rigid vs. Mass Loaded Racks - Help

I'm very confused as to which way to go.

On one hand you have one camp of people who say Light-Rigid is the way to go. eg. Grand Prix Audio Racks and there plenty of great reviews to back up the product.

On the other hand there is another camp of people who say that Mass-Loaded racks are the way to go. eg. Silent Running Audio - Craz and there also plenty of reviews to back up that product also.

If it helps my equipment consists of all tube based gear, amps, pre-amp and cd player and the room in question has a concrete floor.

My current location prevents me from trying out any rack in the luxury of my own home, thus good advice is desperately sought from fellow audiogoners as to which way to go.

Btw, In which camp does Finite Elemente fall into or is it on the fence with feet on both sides?

Looking forward to your responses...