iodine won't kill crypto, so i wouldn't rely on it tbh. i'd prefer bleach as a chemical agent. however it tastes like opening my mouth in a swimming pool. i prefer the steripen b/c of the weight and hassle of a filter. a quick story.
i was out hiking this past weekend, adn i stopped at a shelter for lunch. there was a small family there. dad was down at the stream getting water, said the kids. dad came back up after about 15 minutes with a big water bladder, but it barely had any water in it. he asked the kids where the chapstick was. apparently something got jammed in his msr filter and he needed to take the whole thing apart, rub some of the waxy chapstick on some piece, and put it all back together. then he went back down and got his water. i guestimate it took him 1 hour to get water.
if this happened to me i would've probably stopped at a post office, mailed my filter home out of frustration, and continued hiking w/o filtering - running the risk of getting some GI issues. i mean, seriously, an hour to get water? ultimately i agree w/ sgt rock's stance of 'use what you like'. agreeing w/ sgt rock seems to be a reoccuring theme in my mind