Both products are easy to use for straightforward timing. The Analyser has an ergonomic advantage inasmuch as it's an all-in-one unit and you only have one keypad to think about. For straightforward printing from a lot of negatives it's probably the way to go. But if you want to wring the last drop from a negative, the StopClock offers the convenience of programming a sequence of exposures so you don't have to remember them all in the dark.