These are the four I've got:
I can't tell you which one is my favourite as I love watching all of them. Another one that I like is Spirited Away.
Before I knew of Studio Ghibli I never really liked animé. My only knowledge of it consisted of Pokémon and some rubbish series my ex-boyfriend used to watch that I can't remember the name of.
I was introduced to Studio Ghibli films by the family that I used to be an au pair for. Before that I had been in love with Disney films, and I wan't really interested in watching any cartoons that weren't Disney.
Until now, the only Studio Ghibli film I've not really liked is Princess Mononoke, but it's a while since I watched it, so maybe I would like it better if I watched it now. I think I just didn't realise it would be so violent and bloody. One film I would really like to watch is the new one by Studio Ghibli: Ponyo.
I still think Disney films are good, but at the same time I don't think they're the only ones or the best ones at making cartoons, or other films for that matter. The following clip kind of ruined Disney for me a little bit.
Warning: Do not watch the following clip if you want to continue watching Disney without judgement.