Both sentences could mean the same thing, however I like you best. I like chocolate best, better than anything else can be used when what one is choosing from is not specified I like you the best. Between chocolate, vanilla, and strawberry, I like vanilla the best can be used when choosing from some choices.
I mean here "You are the best at tennis" "and "you are best at tennis", "choose the book you like the best or best" both of them can have different meanings but "most" and another adverb in a standalone sentence has a completely different meaning.
So, " It is the best ever " means it's the best of all time, up to the present. " It was the best ever " means either it was the best up to that point in time, and a better one may have happened since then, or it includes up to the present.
grammar - It was the best ever vs it is the best ever? - English ...
Consider this sentences: This is the best ever song that I've heard. This is the best song ever that I've heard. Which of them is correct? How should we combine "best ever" and a noun in gen...
The meaning of EVER is always. How to use ever in a sentence.
From Middle English ever, from Old English ǣfre, originally a phrase whose first element undoubtedly consists of Old English ā (“ever, always”) + in (“in”) + an element possibly from feorh (“life, existence”) (dative fēore).
EVER definition: at all times; always. See examples of ever used in a sentence.