I have both the MK 6 & the MK 7: A black 4 door MK 6 DSG APR stage II w/ APR IC, carbonio,intake & suspension mods & Nuespeed wheels. About 68K miles sans issues.
Just bought a silver MK 7 DSG 4 door & put light weight Nuespeed wheels on it too (FYI dislike the way the heavy OE Brooklyn's affect the suspension on the MK7 just as I did w/ the Detroits on the MK6.) The stock MK7 is a "better" car in most ways and the suspension IS superior to a stock MK6. The 7 is razor sharp & agile while the 6 is a welter-weight fighter. The 6 is loads of fun but the 7 wants to be pushed harder before it reveals its many pleasures. Basically I like both cars & will keep them: My wife LOVES the 6 so she drives it a lot.
The 7 is pretty damn peppy stock & not a lot slower than my stage II 6 BUT it's clear that the 7 has tons of potential to be unleashed. What I do not like so much about the 7 is the gear ratios relative to the torque curve: 1 & 2 are closely spaced & 3 is where one spends the most time w/ usuful torque. The MK7 has peaks & valleys in the torque curve that are much more noticeable than the APR dyno data shows. The 7 requires that the driver compensates constantly w/ throttle input to get the right balance while doing sporty driving. Simply put a MK6 APR stage 2 is more natural & seamless while the stock 7 is like a race horse that needs coaxing.
If you look at the APR vid of the stage 1 MK7 software you can see the odd hyper 1st to 2nd transition as the tach & speedo bouncing illustrates.
Bottom line: If I had to choose between the MK6 stage II or the MK7 w/ stage 1 & intake I would go w/ the 7 for the following reasons: Superior suspension, fantastic engine w/ & I quote APR "amazing potential for mods that surpass anything we have seen from VW", great balance between daily driving & sport "a car within a car", and a really perfect interior that rivals the best Audi and beats BMW for the most part. Also it has beautiful folded origami body folds & subtile design aspects that grow on you (the darker colors in the MK7 hide the body folds & tension lines but silver, white & red really show off the aesthetics.)
I choose to believe that the MK7 may represent the best car for the price for those folks who want to have their cake & eat it: Great manners, comfort, potential for considerable modding and all around great car that does everything very very well. And FYI I can get my MK7 in a nice controlled drift by disabling the the nanny guards & I don't really see why its can't handle a added power of the APR stage 1 software (and the electronic diff stuff is well within the range of APR software engineers as they are planning a bunch of goodies as we speak. APR is stoked!)