I also ship some other couples, but I'm too lazy to list them... ugh fine.
1. NaLu
2. Jerza
3. Gale
4. Gruvia
5. Cappy
6. Stingyu
7. Rowen
8. Zevis
9. Aquario
10. Miraxis

I also love NaLu, StingYu, Lories, GaLe, Dorandy, LoLu, Alsca, and Zevis.

NaLu is my favorite. Actually Natsu is the only boy I would ship with Lucy, although I do like other ships with Natsu...

I'm not into shipping but out of the top 4 main/canon ships I'd rank them:

1. Gray and Juvia (It has the most development, it's hilarious and the most interesting. My opinion though).
2. Gajeel and Levy (Mainly because its so unorthodox and develops Gajeel).
3. Natsu and Lucy. (Just another main characters couple to me with little development. But it is enjoyable and has such emotional moments).
4. Erza and Jellal (Definitely the most serious one, but it lacks any fun elements and hasn't developed much).

All just my opinion though, not fact.:)

Out of the 4 main ships, this one is the only one that's piqued my interest. In fact, it's the only ship in the entire manga that I can tolerate.

Nalu has had like, little to zero romantic development, at least from Natsu's side (and no, crying over Future Lucy's dead body doesn't necessarily count as a 'romantic' moments, friends do that too. Neither does catching her when she's falling from the sky, among other things. It's all about the romantic undertones, which this pairing lacks). I feel like the only reason people ship it is because they're both main characters, part of the same team and therefore featured together more often.

Gajevy. It's cute, but I'd argue that the development of the ship came at the expense of Levy's character. It's like she revolves around Gajeel now, and that's a no in my book. Two people in a relationship should be able to exist without each other and not be around each other all the time.

Gruvia. Where the hell do I even begin. Let's just safely say that I have never abhorred a fictional pairing the way I do this one, and I won't go into specifics.

Jerza is the only pairing that I like, mostly because it's the one with the least stupid comic relief scenes that plague the other ships. It's also the pairing with the most obvious evidence that they have feelings for each other, in my opinion. All the other ships are either one-sided or vague. Also, it's serious, angsty, and challenging, and that's the sort of romantic relationship I like to read about in fiction.

I don't like the Gajeel x Levy ship. I mean, i don't think they're really right for each other.
I HAAAAAAAAAATTTTTTEEEEEEE Gruvia. It's my least favorite ship in the whole show. It's so freaking one-sided. Juvia, get the hint already, Gray doesn't like you.
I mean, Nalu is okay, but I think Natsu just sees Lucy as a really good friend.
I'm all for Nali. I also like Jerza. In fact, now that I think about it, the only ships in the entire show I like is Jerza and Nali.

Jerza and Evergreen are my favorite.

JERZA FOREVER ....

JeRza FTW!!! It's the best ever. The most interesting one, and also the couple with the most depth.