A Grizzly does have a CVT with a belt.My only complaint with Polaris is I hate the CVT tranny for descending a hill, especially if most of your riding is on mountain back woods. Polaris is going to have way more power and comfort. If the grizzly doesn't have a cvt and is a standard transmission, it will do 100% better going up and down steep trails. Its really hard to control the CVT in those applications, unless they did something in newer models to control descent which isn't on my 2014 sportsman 800efi. Its a VERY white knuckle ride down a steep trail. If most of my current riding was crawling around the mountains and I was going to buy another atv, it wouldnt be a polaris... I would buy an ATV with a manual gearbox. My riding now is mostly desert since i moved, so my Polaris is prefect for that.
And the new Sportsman on some models like my Sportsman xp 1000 has ADC active descent control works great on Down Hills.
I know all the different things between them because I have a Grizzly, Kodak 700 EPS and Sportsman xp 1000 .
The Sportsman is the best at
3 Power Drive Modes
The Grizzly/Kodak is better at
Less maintenance and less repair
Wet Clutch, belt set up can even lower the gear ratio with a modified sheave and shims
No U Joints on driveshaft.
I love the Sportsman.