I'd want them side by side too. Much easier to transfer laundered items to the dryer.

I wouldn't want the sink between, but if I had to choose between that and not having the sink next to the washer at all, and if there were floor room for a laundry trolley, I might go for it.

I have a "laundry walk-in closet". The sink is next to the washer and the dryer is at right angles, but still next to the washer. In the corner between is the back side of the water heater surround (it opens to the outside, not the laundry closet). It turns out that this set up works really well. I think the dryer is even more convenient to the washer, and I still have the sink next to it. In a bigger room, it might feel cramped, however. My room holds the sink, washer and dryer, plus built-in cabinets on the far wall. No counter at all, so tasks that can't be done just on the dryer top are done outside of the laundry room.

I don't have a laundry room sink ... surely wish I did.

Plllog, I had thought about intalling the washer and dryer at a right angle, but had never seen or heard of that set up before. I am glad you described it. I am afraid the corner would be lost space for me, unless I could come up with some creative use for it.

Whatever arrangement you choose, keep in mind accessibility to easily pull the machines when repairs are needed.

Re Dadeos's very good advice, there is clearance for either the washer or dryer to be pulled forward without impedance. There isn't room inside the laundry closet for repairs however. My dryer needed a new something part awhile back. The technician disassembled it and put the cover and drum in the kitchen, where there's plenty of room.

If it helps, my floor plan, before and after remodel, is here. My contractor was all for moving the whole thing, but I just wanted storage in the laundry. Moving the water heater would have been a big issue, and even a tankless would have meant a protrusion into the space. It really works for us the way it is. The lower cabinets have baskets on the shelves for sorting laundry, and there are roll out trays on the shelves that go behind the sink. I use them for empty canisters and a bunch of new tea towels (which will be washed before use).

Perpendicular makes sense if you have a use for the corner and it makes the rest of your plan work. If you can make that corner a cupboard that opens a different direction, depending on what room/space it's in, it could be storage for patio umbrellas and pool toys, boxes of seasonal decorations, raingear, workout equipment, whole house stereo/electronics, or even just a big artificial Christmas tree. I think I'd prefer them on the same wall if I had a big laundry room, however.

Thanks for all the tips, very useful!