He knows what he's talking about though. Seriously I work in a watersports store and I have tons of people coming in and saying how they want the biggest 3 stage board with a super aggressive egde cause they aren't getting any pop. But I can guarantee all of them are cutting out as far as they can, starting they're cut way to fast so when they get to the wake, they slow down and let their momentum carry them through. You can get amazing amounts of pop on a board with a progressive rocker as long as you hold a proper progressive edge, which is needed for basic tricks like backrolls anyways.
Basically AR6rider sums up what you should know, but i'd also like to add to check out O'Brien wakeboards. Ronix, liquid force, CWB, all of them are great brands but everybody seems to leave out o'brien. Now it's not that they make bad boards, no. It's because they don't have some of the more popular riders. Ronix for example, probably the most popular brand out right now, they have some of the best riders to ever be on the water (Parks, Danny, Chap, Ruck) and they make excellent boards. But unfortunately, the quality isn't as good.
Ronix I'd made in china, where o'brien is made in Dubai. Over the summer I saw maybe a dozen ronix boards come back for warranty, and no o'brien boards. Even though the shop mainly sells o'brien product.
For where your at the #1 board I'd reccomend would be the O'Brien Valhalla. It's just an all around amazing board for beginners, intermediate riders and even the most experienced. Not too aggressive, great speed, the right amount of pop for learning with super soft landings. Just go to the O'Brien website and read up on it, or even PM me if you hot questions about any O'Brien product.
Basically, listen to all what AR6rider said, all the exact points to follow. But check out O'Brien boards! Amazing quality, super fun boards on the water, and they look stellar too!