The Lightning Trigger doesn't differentiate between the two types of flashes. Knowing whether there was an increasing or decreasing electric field will tell which form of lightning occurred. My favorite films for shooting lightning are ISO 100 or slower. Transparency or print films work equally as well. I usually venture down to a discount store and buy the cheapest brand.
Light quality is always important to photography.
One difference in daytime lightning photography is that you can find saturated colors at anytime. Generally the cooler tones are found during the mid-day storms. Early morning and PM storms have mixed warm and cool tones. Oh yeah, I forgot to mention, the Lightning Trigger does nighttime lightning too. It automatically adjusts to the ambient light level.