Photoshop on Mac vs Photoshop on PC

Hi,



I am in the process of upgrading my computer from a Windows XP SP2 based P4 to a ''something else''. Given an option, do i go in for a Mac or a Windows based PC machine? Does Adobe Photoshop run better on a Mac as against on a PC if so then how/what is the difference.



I am a stills photographer and my primary need is a machine which can run smoothly and handle upto a 500MB Tiff files and multitask on batch processes.

Primary softwares to be used will be Photoshop and Lightroom apart from prop. camera softwares.



Please comment.

Thanks in advance.



Regards,

Meethil

www.meethil.com