They can't be compared. The 5A Driver was used in a heavy 2x26650 TorchLite host with a large head and a large pill. The pill had to be extended to fit it. The 3.A driver was used in a much lighter built 2x18650 host. With the small diameter reflector, I don't believe there would be anything to...
I'm using this 3.A driver http://intl-outdoor.com/xml-multicell-circuit-board-3a-55126v-p-361.html in this 2 x 18650 light with an MT-G2. It puts out oodles of light with a 3.A driver. Flood city. The 3.5A driver is a lot deeper and hard to fit into most pills. In a light this size I doubt the...
Neutral might be the way to go for you. Neutrals are more true to life colour wise. I have been opting more and more towards neutral. Don't worry about having to pull out the Maglight. The D25LC2 will blow it away.
Nicer build. Brighter. Stainless steel bezel. Reversible pocket clip (not a clip-on). Accepts 18650. I have the equivalent quark, and never bother with it.