Should I get an fm transmitter or a cassette adapter?

I'm clueless about electronics. I have a 3rd gen.ipod, and I want to listen to my music in my car. Things are expensive in stores, so I'm looking into stuff on amazon.So, these are what I'm trying to decide between:
http://www.amazon.com/...0052WAQ64/
http://www.amazon.com/...001IJYLL6/
http://www.amazon.com/...004WYA7EE/
I don't want to spend over about $5, and the things I'm looking at have decent reviews. Which would be best? I could go either way, I just want whatever is better in a techy persons/people who know more about these then I do's point of view. Thanks for your help, and you can offer an alternatives for me if you know of any! (Again, around $5 or less)

I would go with the FM transmitter I've used both and noticed the the cassette distorts the sound hope it helps ya

Fm transmitter would be a better option if there's lesser radio stations out where your at. You can definetetly get better sound quality too.unless your in a more populated area with more radio stations already being used your fm transmitter will pick up static a lot