I'm of the belief that the whitest bulb is the best. It doesn't look yellow in the pic at all, but looks quite white, especially compared to the blue bulb on the left. Higher temperature colors can strain your eyes long term. The right bulb seems to have a larger bright area to me.
I'm not speaking from personal experience here. I haven't used either bulb. I have heard both good and bad things about Silverstars. It just seems like they are better in that pic.