B4i creates regular iOS applications. So the question is not specific to B4i.
With a standard Apple developer account you can install your apps on up to 100 specific devices. There is also an enterprise account which allows you to install on more devices (inside the organization).
I need to distribute my app privately to a small group of testers.
Do you think that TestFlight can simplify the distribution process.
Please, consider that I do not have a Mac, but only Windows machines.