I like the one with the oil finish, it is light but has a lovely warmth to it. The other three are drab IMO. If you MUST go with one of the other three, I'd choose 2nd from the left Weathered Oak. But I think you can do better.

Also, what else is going on in the room(s)? The floor should work together with all the other fixed elements, it is a mistake to choose a floor color and not consider everything else.

The least amount of yellow is my choice. The left piece or the most right are preferred. This gets close to the European Oak popular. Other finishes include Ciranova Ecofix and Bona Traffic.

Thanks for the feedback, I leaning to the neutral (furthest left), right now we have darker stain, so looking to lighten up the house. Just concerned it will look plain. Has anyone seen weathered oak? does it create a lot of variation in the wood that looks busy?

You do not need a stain. You need a sanding sealer and a clear coat. Then let the oak amber naturally, as Mother Nature intended.

the left looks nice. I just installed new white oak engineered wood floors in the last 2 months and the installer uses Duraseal. I ended up doing a mix of silvered gray and weathered oak and I love it. HOWEVER, I have a big problem that developed last week. The floors are all cracking length-wise of the planks and the cracks are as long as 12 inches to 18 inches in some places. And the stain is also getting lighter. I wrote Duraseal today to get their opinion at least on why the color is changing. I also used water-stained because I didn't want the smell permeating my condo building. I will say the oil stain had such rich coloring but it was not an option for me.

Oil stain will turn yellow/amber. Whatever color you choose, don’t go with oil based. It’s usually not recommended here, I’m surprised to see people saying to use it.

"Oil stain will turn yellow/amber."

A lot of people find that desirable, there's a depth and warmth to it that water-based can't replicate.

"Oil stain will turn yellow/amber."

Almost all stains are oil based. You may be conflating oil stain and oil based polyurethane, which is known for turning yellow/amber.

Nothing you seem to be considering are strong enough to be a negative when styles change, but I have told so many people that you can't go wrong with natural. Don't worry about it looking plain, Instead, consider that it's an unobtrusive and malleable backdrop that will go with almost anything you could choose to do in an area of your home.

That said, I do have a particular fondness currently to Bona NaturalSeal and Traffic Satin urethane on White Oak.