Stools with backs are more comfortable but if you want them to disappear under counter & take less space then backless is better. How much overhang does island have? How many stools & which sides of island will they be sitting? I would absolutely make sure they have a foot rest - will save on scarring up the island cabinet with feet hitting. If the stool legs are color of floor, they’ll show up against black of island & tie in to decor. A darker seat (darker than white) will be safer stain wise. Leather / leatherette is a great option.

ETA: stools with arms will stick out much more than either backless or ones with backs.

I'd replicate all the rectangles on the cabinets fronts and the straight lines of all the window pillars with the shape of the stool... no angles or curves. Then bring a little of that green inside too. Lime green accents around would look fresh.

I like this one from your photos. The color is nice with your flooring.

And I like the minimalist look of these.

I like a pedestal base on stools that swivel. Less chaotic appearance when multiple stools are involved.

I'd say first figure out the what the main function you want.

Like height of the stools. I've learned recently looking for ones myself, that a lot of them are too short ( just a bit over 24"), or too tall ( bar at 28"). So figure out your height.

Who and how often will they be used? If often and for hours, a hard stool is uncomfortable.

Swivel is easier to get in and out of, but then if it has a back, that tends to bang on the counter and can look messy with all of them in different directions ( if that matters).

Will arm support be helpful or actually make it even more awkward to get into them?

Then again if none of that matters and you just want something that looks pretty, then I'd go with the black one, 4 rows down.

What are the dimensions of the island and how deep is the overhang? And will the stools be on both sides?

Your kitchen style leans in a traditional direction so I'd think about doing something classic like Thonet-style bentwood stools. You can get these at Design Within Reach:

I like these ones. They come in different colors.

I really like the last set Celery posted.

I like colored stools for pop of color this is my kitchen and those orange stools are my pop. You also need to have swivel stools on wood floors IMO and I also do not think you need a big back on stools since most of the tim you do not lean back.IN your space I love that pop of blue is see

Thank you all so much!! You really helped me think about things like swivel, arms, footrest, and color. I went with these! Hoping they work out ◡̈

That’s a good looking stool. I love the high, rounded back. They’ll look great in ytour kitchen and look very comfortable.

Thank you!