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It looks like it does have digital volume adjustment; the PCB wireframe shown in step 4 of the installation instructions (as well as in at least one screenshot in that shmups thread) shows pads for volume up and down.
I don’t recall reading anything about support for scanlines or color correction, though. I wouldn’t say it’s a question of which is better (OSSC vs digital AV board), but rather which features are most important to you.
If you want both, I think you could use a combination of the digital AV board and a Framemeister. The Framemeister has an HDMI input, so it could directly take the output from the digital AV board; and it should be able to apply scanlines to a 1080p source on its HDMI input, but someone else will have to confirm, as I don’t have any of this equipment to verify that that configuration works.