being a fan of both (DT my second favourite band ever so im biased), i think they are 2 totally different bands to listen to.
DT are more complex, environmentally stimulating, and they seem to have more depth to them. I love them.
In Flames however, are a more straight forward band, they dont seem to delve too much into new areas, and do what they do best.
They do have some good stuff in saying that though.
I havent listened to IF in ages, plus their singer comes across like a snob.
I much prefer DT, but IF arent too bad either.