I like the white swan for counters, you don't have expansive counter areas and white swan helps to give more spacious appearance and opens up ideas for greater backsplash options to be the star. Difficult to give ideas on floor since cannot see the entire space and what it is connected to. Paint will be last so suggest you pull together the samples of flooring and backsplash to see how they play together in your space with your lighting. It will be a great journey!

The top one appears to be a man made quartz. Taj Majal is a quartzite, a stone that is harder than granite. Their performance characteristics, vibe, and price points (for both slabs and fabrication) are very different. Taj usually contains a mix of grays and beiges and can be tricky with gray cabs, depending upon the slab. The slab you show has a lot of inclusions (the orange).

I agree they are not both granite so that you need to get figured out. As for which one along with flooring who knows . I need to see what flooring you have next to this space IMO best to have the same floor everywhere . So a bit more info . IMO that jog in the cabinetry will make you crazy function wise I can see you hitting your hip more than once on the trip from the fridge to the sink. Have you already ordered the cabinets?

Suggest the sink and diswasher be flipped so you're not washing dishes in the corner with no room on the right. Also move the upper cabinet that is above dishwasher over to the far right so it's above dishwasher. Then you have room if desired to have a couple shelves above in that area, or add decor.

Are you set on the layout?

I love taj mahal, but that slab especially does not go with gray cabinets. If you find a slab without the red tones, I think it can work with gray, but probably wouldn't be my choice.

Are there any other marble-look quartz you are considering? That one isn't my favorite. It doesn't do the best job of mimicing natural stone (maybe that's not what you're going for), but something like hanstone mantauk is much warmer and more natural. It kind of falls between taj mahal and the quartz you have shown.