Re: Frame swap
I don't know either of those bikes personally, but road tires are kinder with the vibes. I normally use balloon tires but have a few skinny st tires that do well. I find they handle better but is that much less a cushion. Cruiser frames are also easier on the rider as a MT has you leaning forward.
All have the slight pros and cons and is always some sort of comprimise and personal preference. Swaping just to see if you like it more might be reason enough. Cool part, can always swap back.
Post lots of pics!