I don't have a top 10 list, cause that would involve playing that many (or more) Zelda games, and I haven't yet gotten there... However, here's a top five of the games I've played long enough to make a proper opinion of:
1) Occarina of Time - It was my first ever Zelda and it still holds the magic for me all these years later. Whenever I play it I always look forward to certain bits, like visiting the Zora's, getting Epona, doing the Fire temple
2) Twilight Princess - I really enjoy the human/wolf transformation, the dungeons were a lot of fun, Zora's domain was just plain amazing (the Zora's are my favorite) and a lot of other things.
3) Skyward Sword - I'm really enjoying playing it, I love the skyloft and flying around the loftwing, I absolutely loved actually *pulling* the sword out, the items are awesome and I kinda like having to shift the boss key into the exact right position to open the boss door and plenty of other things as well.
4) Spirit Tracks - My first handheld Zelda and I really enjoy playing it, the train-riding can be a bit tedious at time, but overall I like it. I love the gratitude crystals and how they open up more train tracks options, I love how Zelda actually has an active role in the game.
5) Majoras Mask - I like the game a lot, love getting to transform into a Deku, Goron and especially a Zora (previously mentioned my favorite rase in the games), and I like that the other masks actually has a kind of power, while in OoT they had no power to them. However the 3 day concept really stressed me out. I know a lot of people love the game for it, but for me the 3 day concept really became a hindrance for my enjoyment. I like taking my time to figure things out, so having to turn back time and re-do a lot of things to get back to where I was if I don't manage to finish the task in time - not really for me. So great game, but not my favorite.
I have tried the following games but haven't played them long enough to put them on the list yet; Wind Waker (only got to the second island), Phantom Hourglass (barely played it), Four Swords Adventure (taken it for a spin, but not really done anything yet), A Link to the Past (reached the first dungeon), Link's Awakening (collected the sword, that's about it)