We all took history classes in school...gee whiz.
I've never tried GTS with any sort of soda. Maybe I'm missing out; but I'm OK with that.
My history is short compared to most of you, but in my limited time, I'd go with Johnny Drum black label. Heard it was a good budget pour and tried it because it's cheap. Horrible stuff. It's somewhat drinkable, but nothing about it is enjoyable (to me.)
Let's get back on the subject of the thread.
Normal is an illusion. What is normal to the spider, is chaos for the fly.
As for the worst bourbon. Can't really say I hated any that I've tried, but I certainly do not love Basil Hayden's and didn't enjoy Bulleit. Only had Bulleit one time however and should probably give it another try.