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1,2,3 in that order, with a rather large gap between 2-3 as far as IQ is concerned. On 2 it looks like you used a GND filter over the lens or the gradient filter in post. Drop the gradient filter and paint in the constrast with the brush tool.
I agree with you that for web sized images, the APS-C is plenty. I don't detect any IQ differences vs FF at web sizes. I also dont detect differences tripod vs no tripod, though I am quite sure you would see IQ difrerences there when viewing @ 100%. I don't remember if you're as prejudiced as Ben against B&W, but mid day light often in B&W elevates an ordinary image to a level above.
I used to shoot FF and APS-H. Now, when/if I shoot landscapes its M4/3s.