Opensource or the AP, if they get it out this decade, will give you more control than PP6 engine management and the opensource is less than $100 if you have a laptop already. the AP is $700 ish for the turbo guys so id expect the N/A one to be similarly priced. PP6 is a piggyback... it's not directly controlling the engine management system, so it's not very powerful. Opensource is out now, and has been, for years. Opensource also has a huge community of users to get help from but it also requires a lot of reading and understanding intemately how your engine works. weigh your options, but know that PP6 is the least powerful choice.
Also, there are spacers that will make the rear suspension height match the front suspension height so the space between the wheels and wheel arches matches, in case it bothers you.