I would choose the Photon. White one is best for all round usage. The ASP sapphire light gives out a very wide deep blue beam- an attractive colour and does almost floodlight a reasonable size room. The white version- the ASP aspen, is comparable to a white photon (uses the same LED), but I`m not sure about the Sapphire against the blue photon (not got one). The ASP is bigger than the Photon, and a bit heavier too. Battery life is the same as they use the same lithium cells.
But- the big downer about those ASP lights- that I really don`t like- is that you can`t change the batteries yourself. You have to post it off to ASP along with $3 and they do it, then post it back- leaving you lightless for anything up to a month depending on where you live.
You can change the batteries in Photons- the p2 is a bit tricky with 4 tiny screws to unscrew, but the new P3 is as easy as popping off a cover and swapping them out- done in seconds. The Photon 3 is also waterproof (to a few feet at least) so you can have no worries about taking it out in the rain (not really for diving though). Photon 2 isn`t waterproof although you can take it apart to dry it off if it does get wet. ASP is not waterprof, neither can you open it up so be careful with those ones around water. Lithium cells don`t like getting wet for long periods.
I`d say get a white Photon-3, although of course your colour preferences may vary. Turquoise is about the brightest- wider beam also, and an attractive blue-green colour but you don`t have the colour-definition of a white light.
Where to get a P3? Well they only finally just got started shipping them, pre-orders should be out by now (hooray- that means only another 2 weeks until mine arrives here- Overseas is so slow) but you can order from the manufacturer at
http://photonlight.com , they have quite a few in stock but not all colours just yet. Otherwise, before long many of the big LED flashlight suppliers will have them, look at the Dealer`s links on this site (go to CPF homepage, the Links can be accessed there), or alternatively fellow reviewer Brock has a good pile of links to dealer sites on his LED pages at...
http://www.uwgb.edu/nevermab/led.htm