With all of the different choices, it's hard to decide what mala may be right for you. There are so many colors and materials to choose from, and it can be a bit overwhelming to read all of the descriptions and decide the one for you. The best advice that I can give for this question is this. Choose the one you like!
I think the most important thing to remember is that above all, your mala is a symbol of the thoughts, affirmations, goals, and intentions that you put into it. When you look at it, meditate with it, or wear it, it should remind you of those things, and bring your focus back to them. It represents the deepest part of YOU. You want it to be something that you love, and something that you want to wear. If you go with what you like, then you can't (and won't!) go wrong. :)