I've run quite a few different front wings and tried to get a feel for what effect each one has, but I think there's no right or wrong wing to choose - a lot seems to be personal preference.
They do change the way the front end reacts at high speed, so they definitely aren't the placebo that a few drivers make them out to be. The current trend started with shock tower mounted ones that sit up high, like the JConcepts and Team Azarashi offerings. My first run with a front wing was with Serpent's own offering, which is very XXX-esque, but I found that it made the front end a little too snatchy for my liking. It would probably work on a looser surface with very little front end grip available.
The next one I tried was the same piece of lexan but mounted behind the shock tower, like the ones Jörn Neumann has run in various guises over the past few years, and this one suited me well. Front end didn't snatch, the steering was very smooth and it jumped level. I'm currently running the Azarashi Great wings which are shock tower mounted but a little shallower and higher up, and whilst they don't feel quite as smooth at high speed, they jump just as well. I think there's far more of an effect on jumping level instead of any great changes to high speed steering.
The new trend is to bring the wing in front of the shock tower again, but it's all preference. My next project is to try out some window scoops.
