I've owned both bikes. I still have my 93 B4 and absolutely love it. Far more serious motorcycle than a GS400. In fact, while you can certainly learn to ride on a B4, you likely won't outgrow it, and feel the need for something more advanced, like you probably will with the GS400. That said, the GS400 has the reliability of an anvil. You simply can't break the damned thing. And should you manage to pull off the impossible, parts are available and cheap. Also, working on the GS is far more straightforward than on the Bandit. I could pull, clean and reinstall the carbs on the GS in about a quarter of the time the same task takes on the Bandit. Valve adjustments are far simpler also. So, if you really plan to ride it to learn and move on to something else, I'd buy the GS. If you think that long term, you could be satisfied with 400cc and don't mind working on something a little more complex, then buy the Bandit.