It's the original and still best of the mainline 3D ones pre-BotW. It was groundbreaking, like the best game of its kind by a margin when it came out, while the rest are mere rehashes. Most telling is how much of it is really memorable, whereas I can barely recall anything in WW, TP or SS. I wouldn't be able to tell you about a dungeon or boss in WW, or the characters or story. There was sailing, a lot of sailing, and a talking boat. Conversely, things like the water temple or forest temple in Ocarina are all-time classic moments in gaming.
WW is just a very good game. Ocarina is a very very good game and a piece of gaming history.