Quite frankly you can look at all the reviews and listen to everyone's opinion and then pitch it all in the trash can. Fins are one of those things that the only way you can decide if you like them better than something else is go do a dive with them. Using them in a pool is better than nothing, but only just slightly, most people don't kick quite the same in a pool as they do in the open water.
I started with Quatros (relatively stiff blade fin), that was the top fin in the shop. I thought they were okay until one of the instructors tossed me a pair of splits and told me take them on a dive. When I got back to the shop I bought myself a pair. For me the difference was no cramping, the cramps I got from the Quatros in Rescue almost caused me to be the one that needed a rescue.
Several years later I still dive with the splits and like them. But I should probably also try the Quatros again because my kicking style has changed quite a bit since then. I now do a lot more frog kicks, which may or may not work better with the Quatro.
If you are just taking your OW class, see if you can try them in the pool. Buy something that seems to be comfortable, and ideally not too expensive. Then when you get comfortable go on some dives at the local diving hole and ask to try fins from the store or even other divers. You would be surprised sometimes how many divers have an extra set or two of fins with them.
Chances are if you try several other kinds you will find something that fits your style.
