I wouldn't touch a scooter, but that's personal preference.
I say, if you want to get more ability for easy off-road trail plonking, get the TW200. If you want more on-road ability get the DR200 or XT250. The TW200 will just be easier to toot around off-road, because of the big high floatation tires. But those same tires won't be near as much fun on-road, and you're also pretty much restricted to those same replacements. You only have 1 choice in tire.
I say the TW200 will be easier off-road because... being stuck in the mud on a bike SUCKS. And I think it'll go through mud much better than a regular bike. I'd love to get one as a secret weapon for those really snotty wet and sloppy Hare Scrambles. I think it would clean up. Usually most guys give up after 1 lap, and just being able to do a second lap guarantees a win.