If it’s about Photoshop vs GIMP, I can compare current GIMP (2.10) to Photoshop CS2, which is quite an old software…
I can tell, for me the selection tools work quite similar. There’s the “magic” something, which selects based on color.
You can adjust the threshold, and apply softening the selection edges. I didn’t see any major difference to what Photoshop does with the similar tool.
Then there’s the lasso. Just the same as in Photoshop.
Photoshop has a great tool named magnetic lasso, the GIMP alternative is “intelligent scissor”.
They work very-very similar.
These are the selection tools I used so far, so the list may be incomplete on both GIMP/Photoshop.
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