As so often with this sort of question, we probably wouldn’t phrase it that way in the first place. I’m comparing A and B in terms of their functionality. I’m comparing the functionality of A and …
"The better" is a superlative that only applies when comparing two people or things. "The best" is not wrong when comparing just two, but "the better" makes clear that the comparison is …
According to my CLEP book, the phrase "de lo que" is only used for comparing adjectives and adverbs. Es más fácil de lo que crees. (facil) However, when comparing things, the articles …