Not sure there is a wrong choice. Read all the reviews (lots of great ones in the product review section here) and pick the one that fits what you are looking for. I personally chose Wolfgang Uber coating due to ease of application for first time user and being able to apply it to everything--glass, wheels, paint and exhaust tips. Extremely satisfied with it. Looks great, was easy to apply and just as importantly upkeep is a breeze. I spend around 30 minutes a week now on upkeep where I used to spend 3-4 hours before switching to a coating. Faithful Zaino user for a long time and would have thought it blasphemy that anything could look better. I was wrong. I think it looks better now AND doesn't take 3 to 4 hours. Of course, there was a time that I enjoyed spending that time. Now I enjoy driving the car more than detailing it. Just have realistic expectations. DIY coatings aren't magical force fields as some folks think. You still have to use proper technique for washes. The most important piece of advice, regardless of which coating you choose, is preparation BEFORE coating. Get as many imperfections out as you can by polishing (I still have a few as I wasn't willing to get as aggressive as required for a few stubborn scratches but I know where they are and can live with them. 99% of folks think my paint is flawless) and verify they are gone with proper lighting. Then make sure the surface is free of anything that will not allow the coating to bond to the surface. Follow the manufacturer's instructions, most come with some form of prep "polish". I think most unfavorable comments of any DIY coating, or any other surface product for that matter, results from unrealistic expectations, incorrect preparation or bad technique just like anything else detailing related. For the average DIY guy everything else is personal preference/loyalty wars and marketing genious of the manufacturer for the most part. Good luck!
Link to my review of the WG Coating:
http://www.autogeekonline.net/forum/product-reviews/96565-wolfgang-uber-ceramic-coating-review.html