1. A clicky switch acts as a clicky and/or twisty, as you want (provided it has lockout). Simply turn it on, and lock it out and you have a twisty!
2. With a lock-outable switch, the point of being activated acidentally while in a backpack is not valid.
3. Easier to activate with one hand (in most cases)
Originally Posted by
jorn
2. more durable
They are probably not more durable(at least I think)... On most high-end lights, the internal components of the tailcap are very durable, with nothing to wear out, whereas with a twisty, the metal constantly "damages" the rubber as you twist it back and forth. But even if twistys are more durable, that's probably once you click the clicky millions of times (the LED would probably die before that)
On a completely irrelevant note, "clicky's" uses incorrect punctuation. That translates to "Clicky is" If you want to state a plural, no apostrophe please!