Macro question - Full frame or Crop Sensor body?

[whyone]

I am very new to macro photography, and have what I am sure is quite a basic question, so please bear with me!

I have just bought a Canon 100mm f2.8 macro lens, and have had a play with it on my 5DIII body. I have now established and saved settings which seem to work pretty well.

However it occurred to me that I could get even 'closer' to things using the 100mm lens on my back-up 50D body.

So, my question is simple - am i better using the full frame or the 1.6 crop sensor body for macro shots?

Many thanks

 

[Phil Young]

Crop, it will give you more distance between you and your subject whilst still maintaining a high magnification.