Casements and sliders do provide a bit more unencumbered view from a height standpoint.

In that comparison, the sliders will be cheaper, but will not be nearly as airtight as the Casements.

It all depends on the style of architecture. Have you discussed with your architect?

I would eliminate sliding windows; they have no advantages to my knowledge. Casements are tighter, more expensive and the screens are on the inside where bugs can frolic. dh's can be wider than casements and the same height so they are better for wide views. I use muntins in the upper sash so the view is unobstructed when you are sitting. Muntins don't obstruct the view much when you are up and moving.

Windows get cheaper per s.f. of glass as they get larger so wide dh's can save money. I often use the widest dh available. I have used wide French casements (no center post) but the hardware tends to fail too soon.

The only place I use a casement is for emergency escape from a basement. Over a kitchen sink I use an awning window if the owner can tolerate the screen or omits it.

I worked for an architect in Colorado and recently redesigned my son's old house and then helped him find a new house in Denver. I found that the residential design market was dominated by builders who sometimes forgot that "architect" is a restricted title during conversations with their customers. Some of the renovation contractors are young and inexperienced; maybe new house contractors are better. My son found it too difficult to renovate at a reasonable price and schedule and finally gave up.

I visited my son's neighbor's house when half of the walls had been removed in order to pour new foundations and the upper floor and roof were supported on temporary shoring. It was so obviously dangerous that I pulled my son out of the house and risked offending the contractor by telling him he should immediately add diagonal bracing to every support before my son dragged me across the street. Nothing was done and during the night a typical thunder storm passed through and the entire house collapsed.

Just be very careful selecting a designer and builder. They don't call it the Wild West in jest.

"What are the best windows to choose for value, quality and aesthetics?"

Picture window hit all those buttons, but you don't want to do that, they don't ventilate very well.

"the designer and builder are all about sliders or casement."

Have you ever heard the saying, "If the only tool they have in their tool box is a hammer, everything starts looking like a nail"? Get a licensed architect.