Odd question.
Human nature being what it is, the Brunswick people will say Brunswick and the Motiv people will say Motiv.

We all look for a ball that will carry well on the conditions on which we bowl. Many times I think it is more the right surface and the right drilling than the "right" brand.

  We sell both out of our shop, while Motiv makes a nice product, I prefer the Brunswick line, and have for 20+ years, I see a very nice range of balls in the line-up,
great looks and long time coverstock life, I still break out a 15 year old plus,
PowerBlitz pearl, that with normal maintenance still rolls like it was fresh out of the box.

So my vote goes towards Brunswick   

JT
Avon pro shop
Rochester hills, mi.

As someone who is impartial, what I've seen is this. Motiv works really well for the guys who whack on it at the bottom like it. They roll great, and have a good mix of symmetrical and asymmetric equipment, with different covers. 

I've never owned one. Would drill a Primal Rage if given the chance.

Haven't drilled a Brunswick ball since back in the Ultimate Inferno days, and the only ball I really liked was my Power Groove. In recent years, I've seen their ball reactions change to be much more versatile. DV8 looks awesome, and Radical has some great pieces. I wouldn't have said this years ago, but imo, Big B gets the nod.

Don't ask this question in Muskegon, MI....I think you know what answer you will get.   

the differences are Motiv is a young company and like most young companies that aren't backed by a major brand, they roll early and heavy. Motiv is trying to hit the next big HP release to compete with Major Brand HP releases. So far, I've been impressed with the Sigma Tour, Raptor P7, and Primal Rage. Other than that, it's been early and heavy roll which keeps your angles closer to the headpin, no free wheel unless you have a lot of hand. I personally have not liked the fact that a lot of their releases have been pearl. For me, their Pearl stuff is more catered to sport patterns,.... I see very few sport patterns so I don't really throw them.

Brunswick has made big strides to become more versatile to carry better as you move in deeper. Their HP balls have been true monsters. Their newer midprice balls are 10X better than years past which is something they neglected for a long time and they aren't just step downs from the HP but versatile as all get out. Also, they've been cheaper than most so we tend to sell way more brunswick than Motiv.

We have sold a lot of Rage's and Tribals and I think this Revolt will be a decent offering. Brunswick just has more out there.

The Primal Rage is the only good ball Motiv has ever put out.

the venom toxin is an absolutely amazing ball as well

All companies have hits and misses.  Currently Storm and Brunswick have such a wide range of balls, that anyone should be able to find something that matches their game.  Motiv appears to make some good stuff, but I think they probably don't have quite as much versatility in their lineup.  Primal Rage appears to be a ball that has fairly broad appeal.  Other stuff may not match up with as broad a range of styles. 

If you look at what the pros are doing to their games currently, you see most cutting down their axis rotation considerably to try and hook the ball less while maintaining a high rev rate.  This rolly look use to be the forte of Brunswick equipment during the zone and Inferno era.  Some of their new stuff has those characteristics, and some doesn't.   

Conversely Storm got its claim to fame with skid snap stuff that matched up up to high rev, high axis rotation styles.  They now have lots of stuff out that is very rolly. 

haven't thrown Motiv, but Primal Rage looks to be very conducive to end over end roll