My two cents as a dealer for both - if I have a shirt pocket, it has a Stylus in it. For longer usage I use my ARC LE.
BTW, the shorter, 2-cell Styluses (Styli?) were for the red, yellow and, I think, orange LEDs that would run on the lower voltage. The white, blue, green, etc needed the 4.5 volts of the 3 AAAA batts.
However, the Red Styli I have been receiving for the last month or so have THREE AAAA batts and are now as long as the whites. Don't know why. If you want a 2-cell red or yellow, check around quickly, I'm already out.