Dirty Harry is probably one of the most underrated pinball machines of all-time. It's solid from beginning to end and has great flow too. It's definitely not a beginner pin either. The outlanes can be brutal at times and it's a good challenge but when you put up a good score and get to Crime Wave it's pretty cool to see all the pinballs load into the gun as Dirty Harry says "Go Ahead Make My Day".
T2 is solid and super fast but shallow as it was one of the first DMD games....it's no dog by any means but Dirty Harry is more enjoyable and there is more to do!
Get them both if you can!
I'd rank Dirty Harry a 9 and T2 an 8 out of 10.