Hello
Thank you for your interest. Unfortunately I won't be able to provide an easy answer. There are so many assets out there that I can't guarantee that the builder is able to swallow each one of them without a hiccup. Basically, *almost* anything Xcode can build can be built with the builder, but there can (and often are) subtleties that can't be handled in an automated way and need to be adjusted by hand. Those are most often not related to the compiler used, but rather to the operating system the project assumes to be built on (for example, a custom build phase that would involve a UNIX shell script). I try to provide automated workarounds for the most common cases, though.
If you're experienced enough in compiling C++ programs and know enough of the UNIX command line, you'll be able to handle these problematic cases yourself. If you're halfway, I'll be able to help. But if you have almost no experience in either of these and it's your first iOS app (and your first mobile app in general), then I don't recommend taking the risk, and I'd recommend going the main road (Xcode) instead. I can't guarantee that it'll be easier with Xcode than with this builder - but it'll be easier to tell whether there's a problem with the build system or with your code this way, as you can assume the officially recommended build tool is theoretically immune to these problems.
