I'm starting to think I'm not the favorite twin?

This Christmas. I got an iphone 5c and I was excited. Really happy and gave my parents a giant hug and stuff. Afterwards though, I realized that my twin sister got an iphone 5s. Much more expensive and has better features. This I started realizing that my parents might not love me as much.

Now hear me out.
Before you start saying I'm ungrateful, I just had this epiphany.

You see 2 years ago, my parents went out with me to buy a macbook air. I bought it with my own money and my dad bought a macbook pro with his money.
After a couple of months, he gave that macbook pro to my sister because he doesn't use it often.
Same thing with the ipad 2. He gave to her because he doesn't use it as much.
This I felt was understandable. He wasn't using them.

When me and my sister started going to different colleges. I kept the old car while my dad got my sister a brand new car. 2013. This was understandable because at least the old car was payed off and I don't have to worry about bills in the future.

But now, to give her a obviously more expensive phone with some better features…
I really feel like I'm not the favorite.

Do you think this is unfair? Or am I being ungrateful?

As a twin i would hate seeing this happen with my twin. I would be right up their moaning! I have always been the better one with money, and furthermore, i had more stuff. I think with your situation, some things were unfair like the phone, because unless they got you something else to make up for it, i wouldnt like that personally. You should ask your parents what the deal is and mention these events though. I for one wouldnt leave that unspoken!

I wouldn't say that you are ungrateful, but you are letting the unevenness between you and your twin cloud your judgement a little bit. Do your parents love you both equally, even if you may feel like your getting the shaft at this moment? There will come a time where I'm sure that your sister will feel this way because your parents got you something better. Jealousy over material goods is pretty dumb, but we all do it and I pass no judgement. Just try to remember what truly matters. Try to be thankful for the things you have and if it really bothers you that much, talk to your parents politely. Don't accuse them of favoritism, but tell them how you feel.