Have you tried using LLDB as an alternative to GDB on Linux? Did you stop using it because it's missing some critical feature you can't live without?
I'm mostly interested in hearing from people that used the debugger from the command line.
I've used both GDB and LLDB on Linux. I've found the experiences to be very similar for what I did. I am more familiar with GDB, but once you learn the corresponding commands (or look at a cheat sheet) it's not too hard to do almost all the same things in either.
FYI, here's the "official" cheat sheet: GDB to LLDB command map — The LLDB Debugger