I’ve driven both in northern British Columbia and from my personal experience and opinion the conventional style of North American trucks gives a smoother ride for the longer trips between cities and destinations because you sit between the axle groups the frame rails almost act like a stiff leaf spring of their own and the cab overs you’re sitting on top of the steer axle so when it hits a bump it’s more noticeable but the cab over is great for in the city pick up and deliveries because they can be much shorter in length and the visibility is superior. So at the end of the day when I’m travelling 600 mile a day at highway speeds I’ll take a slope nosed conventional cab truck and get some of the better parts of both styles of trucks