Blue shell to discourage the player who's currently doing well to ever do well in the future, marginally improving my odds in the next races.
I go for neither because deviating from the most direct path to the finish line will decrease my personal time, and self improvement is more important than defeating others.
As a big proponent of the lose-lose outcome to many options in life, blue shell every time
Blue shell because in MK64 it hits other people on its way to 1st
Driving back and forth through the question mark boxes in last place spamming lightning until everyone agrees to stop racing and play battle mode on skyscraper.
I love the crossover meme but It's a false dichotomy, I can drive between :stupidpol:
Red shells in Mario Kart 64 don't go backwards, they just snap back and hit you in the face
That should work, just make sure you're facing the right direction.
Triple red is probably the better option. You can theoretically take out a great number of people and choose when to do so and it's a shield. You'll most likely be at the next set of item boxes just a bit after you've exhausted your shells as well.