I haven't had a chance to experiment with the bulbs, but you can program each individual bulb separately or all of them together as a group. Remember, though, all the bulbs that come with the more expensive starter kit are color bulbs. None of them are just white. In other words, they're called white and color because each individual bulb is capable of producing white light or color light.
Now to answer your question, it is possible to program one bulb to be the color of "cool white" and another bulb the color of "warm yellow" and compare the two at the same time, but I think your question would best be answered by Philips directly. They know more about their product than I do and I wouldn't want to steer you incorrectly based on my opinion of what does a better job. Here's a link to their contact page: http://www2.meethue.com/en-us/support/contact/ Send them an email and see what they say.
Best.