The BigWheels can be used for just about any riding you can imagine but really seem to excel in Supercross. Just like your NX, they can do anything but may have to do it more slowly than a specialized bike.
The BW came in three sizes 80cc(two stroke), 200(four stroke) and 350(four stroke). The 200 and 350 are adult-sized and use ATV tires.
When the BWs were discontinued, the TW soldiered on with it's thinner tires and 200cc air cooled motor. Yamaha used the last 20 years to aggressively upgrade the bike with a disk front brake and some new stickers.
Finally: I had to use spellcheck to get Argentina to look correct, so I don't know if any BWs were imported there. Does anyone else know?