As written above, there are pros and cons to both.

I have arrived at DTW on mainline in Concourse A and then connected to an RJ also in Concourse A, which is a breeze, even if far away, because of the train.

If your RJ is in Concourse B or C, then it's a schlep and is you have a tight connection, it will definitely be tight.

At MSP you can get lucky and arrive and connect in the same concourse, but this is a sprawling facility and your walk/run could be considerably longer (even if Concourse C has a train).

On balance, I'd chose DTW.