The siemens dekas only have a single hole for fuel to spray out of, while the bosch have 4 or more. Here's another comparison of dekas vs bosch
https://youtu.be/41w3sX2Pifs
There's a reason almost all the guys that have cars with stock dekas upgrade to bosch
So basically garbage across the whole range essentially the difference between the "jet" setting and a "shower" setting on a typical garden hose attachment. Definitely will be sticking to the Bosch's. Thankfully ECS tuning is 35 minutes away from me and they sell genuine ones for the VW/Audi crowd up here.
Thanks for the info!