I wanted to make a video that demonstrates:
(1) 4 things I like about the TI36X Pro that are somewhat lacking on the CASIO fx991EX
and
(2) 4 things I like about the CASIO fx991EX that are somewhat lacking on the TI36X Pro

EDIT at 2:44 I state that you have to store the result into A (after you have rerun the calculation). That is incorrect. You could, instead, simply use ANS if you have just rerun the calculation that produces the value you want to use in a subsequent expression. Regardless, the TI's approach eliminates the gymnastics and is much more intuitive in this regard.

As one or two astute viewers pointed out in the comments (kudos!):
Regarding the Casio fx991EX, when finding roots of a cubic function, a root with multiplicity greater than 1 will always be listed last (in other words, any single root will be listed before any double root when finding roots of a function so for x^37x^2+16x12, the calculator will provide x=3 before it provides the double root x=2).