Neither is better nor worse, depending on what you want. Do some reading up on both species and you should be able to determine which one is best suited for you. There are a number of books, magazines, care sheets and experienced keepers with considerable knowledge about both species that will aid in your decision, but in the end it comes down to personal choice.
Too answer your question though, i would prefer ackies! (not because they are better, just personal preference). Goodluck