Personally, I would go with white lights. To many people, fog lights = yellow, driving lights = white, but that's simply untrue. There are white fog lights and amber driving lights. The belief that amber light is best for fog and rain is based on a misunderstanding of Raleygh scattering. The thought is the frequency of yellow light is backscattered less than white light, but fog and rain droplets are large enough to reflect back amber and white light equally. Amber lights are better in snow though, because there is better contrast with, and less glare reflected off of, snow-covered surfaces. Colored lights are usually made that way by tinting the glass, which absorbs some of the light they're trying to produce. So if you're not riding in snow, white lights would be better because they're brighter.
Now, driving vs. fog pattern depends on how you want to use them.
Driving lights cast their light in a narrow, circular beam, like a spotlight, illuminating the road far ahead of the vehicle. The beam angle is very narrow, usually in the range of 10-15 degrees, though some lights are as narrow as 5 degrees. They're sometimes referred to as "pencil beams" because the shaft of light is long and narrow like a pencil. Think of them as supplimentary high beams.
Fog lights cast their light in a very wide beam with a sharp cutoff across the top. 90 degrees is a typical beam spread from a decent set, and I've heard of beams as wide as 120 degrees. The intent of a fog light is to illuminate as much of the road in front of and around the vehicle without shining light on the droplets of water vapor in front of the driver's line of sight, which would reflect back as blinding glare. Their wide beam also makes them useful for lighting up corners and things along the side of the road waiting to jump out in front of you, and the beam cutoff means they won't blind oncoming traffic so they can be thought of as supplimentary low beams.
Because they serve different purposes, they are also best mounted in different locations. Since fog lights are designed to cast their beam of light underneath the rain and fog droplets that are at eye level, they are also usually mounted down low. However, the lower you mount the lights, the longer the shadows they cast. This won't do for driving lights. They're intended to light up the road as much as possible, so they are frequently mounted up high to provide flatter lighting. Motorcycles are a bit limited as to where you can mount lights, but on a rally bike fog lights are usually found on the forks or fender, while driving lights are up next to the windscreen.
Sorry for being so long-winded, I didn't set out to write a crash-course in auxilliary lighting. I could go into some more detail about bulbs, and the design and materials used in reflectors and lenses (or, "Why aren't my $20 Wally World lights as bright as my buddy's $200 PIAA's when they draw the same wattage?"), but I'll leave that for another time.
- Jet Jaguar
It's not an adventure unless you need a tent, a passport, and a leather glove for your shooting hand.