I am not sure if the second one is "wrong", but the first one sounds much more natural.
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Aspara GusIt was some of the best, if not the best, sushi I've ever had.The second seems to leave open the possibility that you've since had better sushi.By the way, have you tried eel sushi? Amazing stuff!As a matter of fact, I have had eel sushi. I think it's called unagi in Japanese, and it sure is delicious!