I got Titanium because I think the white will get dirty much MUCH faster and white accessories (cases, flip covers, bumpers) just never seem to be the right shade of white making everything look yellow or dirty.
I honestly based my decision on the sales woman's personal white Galaxy S3. It was white with a heavy yellow hue on the front from use and a whiter than white hard case. Looked terrible. That alone was enough to sway me to Titanium because I had arrived with the intention of getting white. Plus the Titanium is far better/richer looking in person than any of the unboxing videos can really show.
She had a screen protector on and it was all yellowed from her makeup, against the background of the white GS3 and a different shade of white for the case. That was actually my point. The other girl that works there has a white GS3 with a screen protector and the whole front is slightly blue from sliding in and out of her jean pocket.
I fail to see how a screen protector is going to make the different shades of accessories match. If anything they make it worse.
Truth. Not to mention the hideous light bleed on the capacitive buttons on the White model.
That Gray photo is one I personally took myself to show how even in pitch black lighting there is 0 light bleed around the buttons. Yet the White photo was taken in well lit environment and still displayed horrible bleeding.
Yuck no thanks. Titanium Gray all the way.