They do different things.
WinOLS is a calibration tool — maps, modification, checksum handling.
Ghidra is a reverse engineering tool — firmware analysis, algorithm understanding.
Ghidra tells you why the maps work the way they do. WinOLS is where you make the changes.
The realistic path: Learn WinOLS first. Then add Ghidra to extend what you can do.
In Ghidra Fundamental, we assume you already understand the map level. The course is designed for working calibrators.