Windows 8- Graphics Performance- Photo Editing/Video Editing

My question narrows down to what would be a better OS to use for Photo Editing and or occasional video editing. The software used for Photo Editing would be Adobe Lightroom 4.0 and Adobe Photoshop. All software versions using latest build- approved system requirements would meet critieria with applicable OS and hardware.

I believe Apple has an architecutre that is optimized for graphics. I think it was called grand central dispatch. Apple overall may be optimzed to handle graphics/media with its core technologies but how does Windows 7 or 8 compare?

I'm taking an un-bias approach as I have worked with both Apple and Windows. I do favor Windows a bit more due to cost but I wonder how well my system would handle the workload of photo editing. Yes on paper the criteria is met but what about actual workflows? Would a current Macbook pro outperform a Lenovo Thinkpad W530? Similar specs aside from RETINA dispaly on macbook pro; other hardware is compairable. Looking at the Lenovo site with it's case studies on reliability and performance I wonder how actual users would compare. Any suggestions/ideas on which OS to go with.

Thank you. On the performance end, is you pc lagging doing the simple things such as importing the RAW/jpegs? Does windows handle your libraries well?


Thanks again.