TL; DR; - Get a manual if it is not a DD.
i have been driving manual M3s for the last 12 years or so, both e36 (sold long ago) and e46 as DD. Then I recently purchased an e90 m3 DCT and have ECU + DCT tunes from Evolve with a modified OEM exhaust. I drive both now (e46 still as DD) but I plan to lease an EV for carpool privilege (and sell the E46), so the e90 still won't be a DD. and I don't track my car. Here are my 2 cents.
One thing I love about DCT (other than fast shifts) is the downshift blips; it is music to ears but that is pretty much it.
If you really enjoy manual sports cars, you will find some sadness after buying the DCT, especially if it is not your DD. After a while it will get boring.
Also one downside to shifter paddles is (for me), I get tired driving the car after a while because my hands need to stay on the steering wheel at almost 9:15 position. Maybe I should check if there are longer paddles that I can hold my hand a little higher than where they are so gravity does not work on hands too much
