My answer to this question would be always, the one you have with you. A little while ago we drove for a medical appointment to town and I didn’t even consider taking any camera gear with me. Shortly before crossing the bridge over the Little Maquoketa River down in the valley we saw this unusual and interesting looking cloud. I hit the brakes and even found a spot to move the car off the road. The cloud changed its shape quickly, leaving no time to think about a different location with maybe a better foreground. I just pulled the phone out and snapped a couple pictures. It was the only option for freezing the moment and was done with the best camera available. Is the photo good enough for a larger print? No, it isn’t, but it helps to remember and share this great moment that was presented by mother nature.