I agree.A hardtail will teach you to be a much better rider b/c there is less room for rider error. FS bikes will help you become a faster rider once you do learn all the basics though. I would only buy a FS as a first bike if you had a decent amount of money to spend on a nice one. Cheap FS bikes dont ride very well in my opinion, but thats just me.
Fixed that for you.A hardtail is just as capable of doing anything a dually can, it's just a matter of going a lot slower.