I did a review on the Philips Xtreme...by more yellow, think more straight up light. The silverstars have a silver cap on them and have a blue tinted bulb. The philips xtreme are clear all over.
Talking about lifespan, that is the problem with halogens...the brighter you get the less the lifespan is. If you are looking for something that will last longer with some more brightness....I have 2 recommendations for you.
1. Sylvania Cool Blue. The shoot out a whiter light, which I had in my 1990 geo prizm lsi. They actually were a pretty decent light for 23 bucks, and have a long life.
2. I believe, going off the top of my head with no google

(oh no...), they are called xtravision. (just googled

) and they are!!!! They aren't as bright as cool blue, but they last longer.
One thing you have to remember in defense of the yellow bulb. Your corolla or prizm is a Daily Driver, so you drive in bad conditions sometimes. The yellow helps you too see better in rain and snow. Hence yellow street lights.
Hope this helps...