Since your asking for opinions...
1. I've owned autos and SMG and DCT now
2. Automatics piss me off, I went with SMG because its a very fast shifting amazing setup with the "ability" to be set to an " auto " mode.
3. 6MT is cheaper than the DCT lol, thats the only good thingabout the 6MT, oh and the 6mt wont have issues later on if the DCT would because of more parts.
DCT: Made for racing and auto-like driving
6MT: This tranny is only for the people whom still think they can shift faster then a DCT would. (joke)
e46 m3 Black
Too many mods