MicrostockGroup

You might want to define your question a little better.

If I answer the question ("What is the site which display the images best?"), then I would have to say iStock, since they have one of the largest thumbnails, their watermark is very good, and they have the best zoom option on the market (that I know of).

But if you are asking about "user interface" or something else, then that is a different story.

First, let me say, I personally have been down the USPhotoStock fiasco road along with many others here.  And... being that it was my first site to upload to... and since, I've sold only 4 pictures  (since ?july?)......   that all being said,  I know it will sound odd for me to say..   that their display of the subject picture searched for is great!  It is very large and sharp.  I think Lucky Oliver displays great as well. 
   But to cover my backside, that's about all I can say positive about USPS.
okay, let me have it...............   LOL