I was a bit worried about the belt on my Yamaha but now that I have some miles on it, I can safely say I like it better than the electric shift on my 08 Honda Rancher. I can't say how it would compare to a dual clutch trans though.
I have my first Honda Pioneer 520. After decades of dirt bikes and dual sports I got my first ATV in 2008 and it was a Honda rancher so it had the shaft drive just like the pioneer.
In between those two machines of 2008 and 2021 I had six brand new Japanese ATVs. By far the CVT belt system is smooth predictable and totally dependable. Many of those dealers for Yamaha, Suzuki, and Kawasaki don't even stock the belts because it's just not something they sell.
The Honda shaft drive is fine but it is not as quiet and smooth as a belt and honestly I don't see why people make their decisions based on just this because it's a poor basis. There's a possibility that more power delivered to the rear end because it's a shaft drive but I highly doubt it that it's measurable or significant.
I love my Honda but the problem with the transmission jerkiness and noise (quite frankly to scare the s*** out of you sometimes) is annoying but tolerable.
I certainly wouldn't trade the machine based on that and I wouldn't buy it either based on that. How to make a great product as to do all the Japanese manufacturers.