I have been had the shout forever now and best comparison I can think of is this. The storm line is going to for the most part have a nice clean exit off the pattern, much like a hyroad.
The roto line IMO through my own observations is big flashy movement, (granted they make control peices ofcourse), "hey look at me" style.
So I would have to say the the ride is going to be smoother and Probably more even throughout its 3 stages of motion.
The loco should be more length and more flip.
When I throw both lines they always remind me of throwing two balls...the hyroad and the nomad...
One is your control (storms always "roll") one is your motion ball (roto's always hook a lot for me)
I think storm and Brunswick are very similar when comparing that Roto is similar to dv8.
Ride for control,
Loco when u wanna fling it out there.
If tough to say that becuase they both are filling the same spot in a bag. I would every video you especially any videobmakers that showcase both balls.