I consider a brand and its high end counterpart as one - Delta and Brizo - because the parts are interchangable.

Also, it depends on how you are mixing brands. Installing a Moen showerhead on Delta trim is okay as long as the finishes are similar, but having a Delta faucet on one sink and a Moen faucet on another sink in the same bathroom is not.

I would probably stick with one brand (and/or is high end counterpart) per bathroom. We used Delta in the bathrooms because every plumber we talked with recommended them. But I would use whatever brand gave the function and look I wanted for the kitchen. Faucets aren’t a big deal the change. Tub and shower plumbing is.

What is the point of the question? Why would you change any of this if you are selling. Pretty sure most buyers are not checking out the plumbing brands .

"I would expect some buyers would at least prefer quality name brands over off-brand products. As a start, going with at least one or two of the big three brands (Moen, Delta, and Kohler) is a good choice. If you have the money to splurge, there is also Delta's luxury Brizo brand as well as these high-end European brands."

None of that was not what you asked however. Again, what is the purpose of your question or poll?

I wanted to see what user preferences were on up to how many brands of faucets or showerheads should be in their home, either for personal preference or for selling their home now or in the future. My neighbor across the street insists they should all be the same brand (in this case Delta because that is what the builder installed). I personally think two brands are fine, but three might be too many.

I don't see why it matters? I might choose my fixtures on how they look in each room. If I'm constrained by brand, then they might not have a fixture I like as much as I do the one from yet another brand. Why your neighbor's insistence on one brand?

In my case, for the kitchen and laundry room, I chose Moen for specific requirements. For the kitchen I installed the U by Moen Smart Faucet which is the only smart faucet that can run on battery power, and since I don't have an available AC outlet, I cannot install the Delta or Kohler smart faucets without hiring an electrician. For the laundry room, Moen is the only major brand to make a pull-down laundry faucet (plus I got promotional launch pricing on it for being a Moen Plus loyalty member); Delta doesn't make anything similar at all, and Kohler makes a pull-out but not a pull-down.

For my bathroom, I chose the Moen Genta faucet for the looks and the fact I wanted a waterfall faucet, and for my shower, I chose the Moen Verso dual showerhead, which I think is an excellent showerhead (our other bathroom has a Delta In2Ition).

Remodel in 2015 kitchen, 2.5 baths, master walk in shower. All Moren with the exception of the shower sliding bar handheld which is Hans Grohe and the kitchen faucet which is Blanco. I think sticking with one or two is ideal as long as the finishes and styles are similar (all chrome, all brushed nickel etc). In our situation, the .5 bath and the kitchen are far enough away from each other that you would never notice that the faucets were different.

As a potential buyer, I would absolutely look at all the "hardware" for some level of consistency. But that's just me.

I think stylistic consistency is more important than brand. My midcentury house has Kohler Taboret faucets on the vanities (designed in the 1970s), with Brizo shower bath systems, with some expensive European tub filler and Speakman shower heads.

They are all very consistent in design.

Why 4 different things?

The Brizo vanity faucets were too obviously 2010s .

The Taboret shower set up was only off and on, temperature adjustment only.

The Brizo tub filler was too short and kind of awkward looking.

The standard Kohler shower head had no adjustment.

The big square Brizo shower head was too big, too overwrought, too obviously 2010s.

The Speakman shower head is very plain and more adjustable.

So it's four different things in one bathroom but with handles that match and other stylistic features that go together, look midcentury, and provide features that one brand could not, in this case.

I remodeled my previous house over many years. I think I had at least 5+ different brands. Most buyers will never notice unless they need to make a repair. All the brands were high end.

In my current house, which we built during covid, I wanted to simplify my design choices so I went with Brizo for all the bathrooms and Kohler for kitchen, but due to covid supply/availability issues my prep faucet is a different brand. Seriously, no one will ever notice unless there is a problem and a particular faucet needs to be repaired. This is assuming a complementary design was chosen for all the different brands, to keep to the overall design of the house.