I'd recommend taking a look at a Photon with a white bulb before making any final decisions between it and the Solitare. The white and green bulbs will certainly appear brighterAssuming each is equipped with new batteries, the Solitare may be a bit brighter at the center of its beam, but for me, that's pretty much where the advantages of the Solitare end.
I personally don't rely on this class of light for much more than keychain duty. And in that role, the compact size and feather weight of the Photon puts it head and shoulders above the Solitare, IMHO. It has no real bulb to burn out, and the batteries have an extremely long shelf life and tremendous burn time, especially considering their diminutive size. I even use the Photons for zipper pulls on some of my backpacking equipment.