Also if it matters, light blue subway tile will wrap around entire back wall behind/next to shower and tub.

A curb top is not tile, ever. Use the solid white from your vanity.

What is your waterproofing?

I am trying to understand? A broom closet size shower in a bath with a gigantic tub......

Maybe show the entire bath plan?

That shower is not waterproofed , you always use solid material for a shower curb and what is the size of that shower it does even look to be 36 x36. I sure hope the tub is not free standing either .

The floor tile doesn’t lend itself to being the curb, I also don’t like the idea of a skinny blue stripe in front of the shower. Why not make it from all counter material? Patricia what are you seeing wrong with the schluter application?

Shower is 41x41, the angle makes it looks smaller than it is. It isn’t a big shower, but it also isn’t a big bathroom.

"That shower is not waterproofed"

Patricia:

You failed to recognize Kerdi when you saw it. That's some of the best waterproof tile backer available.

Sam:

I'm not a fan of tile-on-the-flat. Use a solid piece for a cap please.

The waterproofing is bright freaking ORANGE, which you have in your kitchen, so not sure how you cannot see it. Unless you are blind, or color blind. Or really just do not know anything, and only parrot back what you've heard actually knowledgeable people say. BBBBBBBBBBBBBBBBBBBBBBBBBBBB

That's waterproofing.

I would consider solid slab on the vertical of the curb and on the cap. Very clean.

Thanks guys. Contractor still thinks I should go with the blue wall tiles (a few pictured at back of shower) on the curb front and then the solid quartz top but I see what you’re saying that solid pieces on front and top would be cleaner. (Contractor is not a designer, nor am I, just doing my best here).

If I go that route with solid white on front and top of curb, would the inside of the curb also need to be a solid white piece? Or could I use the wall tile there?

I would use solid surface there as well, definitely.

The inside of the shower is 41" or to the outside of the curb?

Yes continue with the solid white.