I have a good experience with Cutter (Rizin's official GUI).

Anyone can comment on the functionality difference between the two? Any advantages to using Ghidra directly?

I must confess that when starting out I opted for Cutter just because of Ghidra's JVM dependency. But this is only due to old scars and my aversion to installing Java is probably outdated now. (I am not the only one though: Cutter can also use Ghidra's decompiler component, and its website proudly adds "no Java involved".)