LLDB is now installed. It did come installed on my macbook, so I used it. According to Lazarus, this is beta software.
For all I can say, the "Lldb with FpDebug" will give you way better results than any gdb based version. And be more stable.
The reason why it was marked "beta" is, that when it was new, it had way less testing than any of the other new comers.
The thing is, I (as the main author of it) only run some once off tests on it (and some few tests after bigger changes once a year or so). I don't actually use Mac at all. So there is no continuous testing from me. (Same was with GDB, only back then GDB was used on all platforms / still had differences on Mac....).
So the only quality feedback I have is the absence of bug reports. I know there are some people using it. I have no idea how many. So I never removed the beta (also I never was reminded of it, I don't get to see it).
But probably time to remove the beta.
After all, the lldb itself is not in our control. And the actual FpDebug part is mostly shared with FpDebug on other OS. So that part is well tested by now.
From all I can tell, lldb is way more stable than gdb. And any data inspection is done by FpDebug.