I've listened to both and to me the Sennheisers were too laid back. Especially for rock. They just didn't have the slam of the Grados.
On the other hand, I don't think you'd find anything more comfortable than the 600's.
Both will benefit from an amp. If you're going to try to run without an amp, get the 325i's.
On the other hand, I don't think you'd find anything more comfortable than the 600's.
Both will benefit from an amp. If you're going to try to run without an amp, get the 325i's.