Depending on your mods, you might not benefit from a custom map. The autotune unit or Bazzaz or Motty units works well. They require you to make some decisions and operate your bike in a certain way to get a good map. The wide band sensor that comes with Autotune is only good for about 50 hours. You want to get a map quick and then take the sensor out. The cool thing about the autotune is that you could get different maps for spring/fall, summer and winter. Or if you go to the mountains, you could remap for your environment. A dyno can't do that.
The bad part about the autotune is that you don't know what kind of power is being made. The unit will tune for a specific AFR, but you don't know exactly which AFR your engine wants to make peak power. You need a dyno to tell you that.
The best way to tune your bike is a combo of dyno and self tuning device. Get a custom map from the tuner and than run the device to get a better map under real world conditions.
The autotune is more bang for your buck if you just want the cheapest solution. You'll get a good tune. Just make sure you use the device correctly.