Oh, that's an easy decision: A. My least favourite gag is an over-the-mouth gag, like a cloth tied above my mouth. Why? Because it's so ineffective, it's nothing more than decoration, and it's too easy to get it off. So that's why I choose answer A: While enjoying my bondage, I'd just get rid of my least favourite gag and start yelling until my captor finds a proper way to shut me up. But seriously, I cannot really imagine a (sane) way to gag me that I would really hate. I'm fine with ball and ring gags, that make you drool, tape gags are great anyway and I don't even mind panties stuffed in my mouth (yes, freshly worn pairs too). If anyone can think of a truly horrible gag, challenge me via PM and I'll try it
My favourite bondage is legs tied together, arms tied to my sides. Maybe cling film or tape wrapped around my body to make it really secure. Or even a full mummification.
Next question: Would you rather...
a) be denied any orgasm for a month and be closely watched 24/7 by people and/or security cameras or
b) be denied any orgasm for a week and have to wear a chastity device (which can be removed for 5 minutes per day to clean yourself under supervision)