Barrels accuracy and all that jazz
Most barrels are of very similar performance, the biggest factor is the paint to barrel match, so buying one of a bore to fit the paint is a better idea, both companies (Dye and Smart Parts) are very respected companies, so both will be excellent barrles.
Another option is the freak junior, a bit more pricey to get the barrel and the first insert (one in the midle of the range would be a good start) but individual inserts would then be much cheaper than new barrels, but you would still get the increased flexibility. So once you have the first lot, if the paint is a bit big, get a bigger bore insert etc).
If they are anywhere near as good as the Freak then they will be sweet.
Good luck with whichever you get
Richard