Pretty easy read.
http://www.amazon.com/Enter-Zone-Dietary-Road-map/dp/0060391502
CrossFit currently endorses the Zone and teaches it in the CF trainer courses.
Enter The Zone: A Dietary Road map by Barry Sears et al. Link: http://smile.amazon.com/dp/0060391502
Sorry, I should have included it. Here you go!
> what nutrition system is the best for me?
Whichever one you can follow consistently the longest. Anyone can lose twenty pounds, but very few people can actually keep that weight off for a year or more.
A few people below are recommending calorie restriction with carb/protein/fat tracking. The IIFYM plan is a no brainer, but "moderation" sometimes doesn't work for people who have a relationship with food that goes beyond just calories.
Zone you really have to purchase the literature. Too much to cover in one comment, and to be honest the entire concept can really only be best explained by someone who has followed it for quite a bit of time. But don't dismiss it entirely. http://www.amazon.com/Enter-Zone-Dietary-Road-map/dp/0060391502/ref=sr_1_2?ie=UTF8&qid=1412105600&sr=8-2&keywords=Zone+diet
Paleo is popular primarily because it works. There is quite a bit of flexibility in eating that way, but it is essentially low carb. Not unlike Atkins. You simply eat as much meat/veggies/fruit as you want, and leave out processed carbs entirely. http://www.amazon.com/Paleo-Solution-Original-Human-Diet/dp/0982565844/ref=sr_1_1?ie=UTF8&qid=1412105648&sr=8-1&keywords=robb+wolf
Your best bet is to give each approach a few weeks before sticking to it or moving on.