IMO, neither is preferable because the high pressure .327 round loses way too much juice in a barrel shorter than 3 inches.
Still, were I forced to choose, I prefer the build design of the Taurus over that of the Charter. The crane area on any/every Taurus is larger than the same part on any/every Charter. In actual use, neither gun maker has a stellar reputation for the best products in the industry.
I'd save my money and get the SP-101.
Attention Brass rats and other reloaders: I really need .327 Federal Magnum brass, no lot size too small. Tell me what caliber you need and I'll see what I have to swap. PM me and we'll discuss.