ISX or the MX 13?

Ok folks im doing the research now, there are numerous threads on the ISX but not so much on the MX 13 there's a truck that i have my eye but its running an MX13, and i any help on reliability would be outstanding thanks

 

Thats a 1st, Ive been told that the MX is made by Cummins,
From what I understand the 2013 ISX15 is supposed to be much more reliable in regards to the regen sys.

 

I had a BRAND new 2009 Volvo D13 with the DPF system on it and that thing was in the shop at least 1-2X a month on average for issues with injectors, regen, Thank God it was under warranty at the time and I was running as company driver but the down time was haarrable.
However, ive heard the pre emissions D16 is a Beast!

 

Im in California so im stuck in a way, I can buy an older pre emissions truck and dodge Carb and risk getting fined 1500-10,000.00 or buy an emission-ed truck and risk the regen system putting me in the shop and maybe out of business. Hence the title of this post, the lesser of two evils i guess.
And why I am going o/O ? just livin the dream, something ive always wanted to do. I would rather try and fail or succeed and say that I did it, than to say " Man I shouldve at least tried"