You know easto i don't like Sweet Potatos either unless their covered in Brown Sugar and Butter---haha
If you can eat them then they are a good carb source, but i don't think they are necessarly better then say a Potato, Rice, Oatmeal, ect
Everyone is really different - I stick with BABY NEW POTATOS and WHITE RICE, because thats what works. Like i mentioned i don't like Sweet potatos and oatmeal bloats the hell out of me typically.
I will say that when i set up a diet with a client i do like them to eat:
Red Potatos (Baby's)
Yukon Golds
Sweet Potatos / Yam
I don't like using your typical Russet Potato, and would stay away from them. Way to much starch.