I have filed over a dozen businesses with Incfile, and the process has been smooth, the fees transparent, and customer service (pretty) reliable. The most convincing reason to use Incfile over any other incorporation services is their price.
Each company offers different packages that are basic, mid-level, and pro. When I file with Incfile, I always choose the “Silver” package.
It's hard to know precisely because some filing times are different in each state. BizFilings does not take vary between states and offers times based solely on the packages you purchase.