Any of those could look great. I just depends on what else you plan to do in the room. I would be careful of the light grey only because it is so close to the color of the floor.

Would you consider a colour? I think a blue or green couch would be fab.

Consider using the darkest gray in the flooring as your sofa color guide and then you could add some burgundy (via chair and/or a throw pillow). Consider Burgundy and Graphite for chair colors:

https://www.potterybarn.com/products/soma-delancey-upholstered-wingback-armchair/?catalogId=84&sku=7570592&cm_ven=PLA&cm_cat=Google&cm_pla=Furniture%20%3E%20Chairs&cm_ite=7570592&gclid=EAIaIQobChMIyrSHtaWZ6wIVFEWGCh3OrA6qEAkYBiABEgK3zvD_BwE

darker grey is going to be more forgiving when it comes to (inevitable) grime. I love a white couch, but oh so risky. you can add lightness and color with pillows and accessories.

You might also consider adding something interesting to the end of your island.

Perhaps you could park a serving cart there or add:

Wainscoting?

A wood "x": https://www.pinterest.com/pin/74590937555817887/

Metal wall sculpture. "love": https://www.pinterest.com/pin/147633694023290379/

or a sunburst or one that is "music" related -- something that reflects your personal taste.

Or "hello" or "family" or "welcome" "or relax": https://www.pinterest.com/pin/155303887195174978/?d=t&mt=login

If you choose a wall sculpture, you'll want something that catches the eye but does not "reach out" and grab the clothes of those passing by.