Opinion on volvo vs detroit

So I am looking at 2 different trucks to purchase. It will be for a team. I have narrowed down to the following:
2012 cascadia with dd15 with def 511k miles asking $56k
vs.
2013 volvo 780 with d13 not sure about def yet (looking at it in 3 days to confirm) 508k miles asking $69.5
This is 3rd truck for me. I am adding as I go. I currently have 2013 cascadia with cummins which has been a disaster.(I'll never buy cummins again) I have a 2nd cascadia 2011 with DD15 (no def) no problems yet.
I know what i am going to get with the detroits. I havent heard anything bad about the newer volvo so I was just checking opinions from other people.
I have heard in the past that volvos are more expensive and parts are harder to get but I have heard recent that has changed for better because of more locations in U.S. now.
Opinions please....
or should I entertain paccar?

 

Even with the def?

 

Another concern would be mpgs...
Detroit expect low 7s
volvo xe package high 7s low 8s
10k in fuel savings per year?

 

I thought some of the volvos use scr with no regen which mean no def I thought? Might be wrong...
48 states teamed open board loads...primarily atlanta,columbus,dallas,Los Angeles
some n.w. but not much.
volvo is an i-shift with 2.64 by the way
detroit 10 spd with 2.53
freight is light LTL under 25k consistently

 

I stand corrected...thank u for clearing up

 

Yes...
FL Dealerships take at least 2-5 days for repairs now matter where u are at.
even my local guy take 2-3. It's just a fact of live now adays.
what has been your experience dealing with volvo dealers for repairs over past couple years if any?