Most here on Scubaboard will say back plate with wings. But that isn't the only choice. Some divers find the hard back plate uncomfortable on their backs. it does have the advantage of being customizable since you can mix and match components.
Personally I dive a back inflate Zeagle Stiletto BC. Although back inflate BC are rumored to have a tendency to push you forward I've never had that experience. It also has trim pockets in the back to help with trim as well. Zeagle has an advantage in having a component system as well. You can get a medium BC but switch out the straps to a large if you needed the longer torso for example.
the biggest factor in a BC is fit. It has to fit well or style, brand, or cost doesn't matter. Make sure you like the fit first, then worry about style. If you like the I3 and the price is right and it fits well then by all means buy what you like. You can achieve better trim from distributing some of the weight in the front pocket but also moving some weight to the back. You should be able to do this with a regular bBC with weight pockets in the back, it doesn't have to be a BP/W set up. If the BC doesn't have back pockets you can always add some.
You should have enough lift to cover the most amount of lead you think you will use. For example if you dive say 26 lbs. weight in you wetsuit you need a BC with at least 26 lbs. but probably higher say 30 lbs. or even more.
I first came to scubaboard to read reviews on different types of equipment. One diver had posted a review on the Zeagle Stiletto. Several others chimed in to criticize the original post. Since the majority of comments were positive I decided to go with my gut and buy the Stiletto. Which is ironic because the BC I originally wanted was an Aeris 5 Oceans. The LDS didn't carry that one but did carry Zeagle BC's. Looking back I'm so glad I went with the Stiletto. Its not too heavy for travel, is very comfortable, and had plenty of pockets and D-rings for my stuff.
Aqualung has a solid reputation and makes high quality gear. My own personal take is to buy a traditional style BC over a Back plate but that more because I'm more familiar with standard scuba gear. There are advantages the BP/W set up has but that doesn't mean one is better or worse than the other. It's more about personal preference.