I'm a freightliner fan, but I don't blame you for picking the Volvo over the Cascadia. I test "rode" in an almost new Cascadia and it was the noisiest rig I had encountered.
I agree that you should speak to both builders at length and tour their facilities, if practical. If I was going to buy new, I'd look for the manufacturer that was going to treat me like family. A good local dealer would be a plus, but not a deal maker for me.
2006 Renegade/Freightliner Coronado 43', Detroit, twin screw, 12spd
2001 Ford Excursion PSD
1997 F350 Crew Cab PSD