Macro Lens Set

Macro Lens Set
Canon or Sigma Macro?

I am looking to buy macro lens to go along with my 50D …. He had the idea of buying the Canon EF 100mm f/2.8 Macro USM, but my HIGHLY friend recommended a Sigma lens instead when it comes to macro photography, indicating that Canon Sigma beats at the moment. So anyway, I am a draw between the Canon EF 100mm f/2.8 Macro USM Sigma APO 150mm and f2.8 EX DG Macro. I'll be using the lens for floral work, a work of insects … and I would use for portraits too. What would you suggest and why?

www.dpreview.com to compare the lens then buy the canon.

Monobanda – Cheap macro lens