I own a 6MT and have extensively driven DCT cars. Both have transmissions have their + and -.
To be honest, transmission choice wasn't even in my top 3 priorities when I was looking for my used car. Actually, I never even drove an MT M3 before I took delivery of mine!
The absolute biggest advantage for me is lack of complexity of the MT. I plan to keep the car for years and years to come. Definitely well past how long the MT will last.
On top of that, how fitting is it that my car will be last NA engine matted to a MT? Went out for a drive after on Friday, and it's such a mind clearing experience.
Having said all this, I will have a DCT car in my garage (think F10 M5 at the end of its life cycle
). I'm just really glad that my M3 is not one of them.