…and, oddly enough, a GSX-R, I’d probably go with the DR-Z myself for versatility and fun-factor. It’ll also be easier to do low-speed maneuvers thanks to its light weight and steering geometry. As IBA270 also pointed out, it’s a less punishing bike to crash (no fancy schmancy fairings). However, there are a few issues with the DR-Z that are worth knowing about:
1. Security becomes an issue. That bike is so light that two high school kids (or one college football linebacker) could carry it away. You’ll probably want to get yourself a disc rotor lock or lo-jack or something.
2. The DR-Z has a really high seat. It will sink down a lot as soon as your weight is on the rear spring, but getting your leg over in the first place can be hard if you’re too short. Make sure that you’re not!
3. The bike has no tach and no fuel level indicator (not even a low-fuel light).
4. The bike offers no wind protection at all, so you will get fatigued riding at high speeds (over 50mph) for long periods of time.
I love both bikes (the Ninja and the DR-Z), and have recommended them heartily, so really it’s down to what you want to ride and what feels comfortable to you. If you have any questions regarding how one performs in a particular way versus the other, feel free to ask. Otherwise the ball’s in your court.