I have ridden the Wolf. I have inspected the Wolf with a fine tooth comb. I love it's looks. Unfortunately that's all it has. It feels cheap and flimsy compared to the Grom. I don't believe the Grom would make a good off road bike, especially a heavier person like me, but I'm sure it would hold up better than the Wolf. I got it to replace a Yamaha Vino 125 scooter. The scooter had the advantage in town, no shifting. Neither are freeway legal, I have bigger bikes for that. I had put 34,000 miles on the Vino 125 when the third belt broke, for no reason I could ever find. I mean it literally shredded. I fixed it and rode it a couple thousand miles, but never trusted it again, since I never actually found out what happened. So I sold it. Another big problem with the scooter is that it wouldn't climb. I mean it wouldn't climb at all. Half my state is desert, the other half is mountains. With the scooter I was restricted to the desert part. The scooters CVT lacked low enough gearing to climb steep mountain grades. I actually tested this by using a clip on tachometer designed for a Jr. dragster. I checked RPMs at top cruising speed on a flat level road. Just over 9000. I then checked them climbing a steep hill with a heavy load (mostly me) RPMs were just over 5000. Way below the powerband. No wonder it wouldn't climb. With the Grom, I can downshift it enough to keep the engine spinning in the powerband. Yes, it's slow going, but it's not doing any damage. Even fully loaded 18 wheelers climb these grades in first gear. So I would say that if you never leave town, a CVT scooter has the advantage. If you rack up a lot of miles on secondary highways like me, and like to ride in the mountains, the Grom has a big advantage.
As for the SYM Wolf 150, I do not trust SYM. Or actually their importer, Alliance Powersports. SYM builds high quality scooters. I now own an HD200 for in town use. And I have had issues getting parts for it. I am afraid Alliance is going to go belly up, and if they do, that means no parts for any SYM products. With Honda, you just go to bikebandit.com, order the parts, and they arrive at your front door in a few days.