I shoot Adobe 1998 (Mode II) 100% of the time. This mode captures the most color information at the time of exposure. A color balance that closely mimics daylight slide film is CLOUDY-3 or SHADE+3. The former is a little more saturated and the latter is a little more realistic in my hands, even those these two settings are virtually the same color temperature. For shooting foliage and to bring out greens, I will sometimes shoot CLOUDY-2 to CLOUDY, but otherwise I find these settings far too cool in daylight lighting. You should avoid AUTO as it is not consistent. Even better, shoot NEFs and you can fiddle with the color balance later without damaging your image.