I highly suggest getting only one and learning it to the point you are very comfortable with it, and then getting the other.

The song you linked, Rytm could easily make that track on its own with a bit of sample prep. Lots of use of compression as an effect in that track, too, so another point for Rytm. The “Hit” function on Rytm’s compressor side chain EQ would put you in close proximity to that effect.

That song would be tough for A4. It sounds almost entirely sample based. Do you have the Volca Sample? It could take care of the drums and sampled fx bits in that song, and the A4 for recreating the sampled synth bits. But you’d need a compressor to round it all out.
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No, i do not own the white Sample buddy.

I think that in the end will be a last minute call for the Rytm or the A4 !

Thanks a lot !