The café and tier-on-tier traditions come from mild-weather places where an uncovered upper window is free daylight. Here, that same open glass is a heat source for half the year - which is why the style question in Arizona always starts with which way the window faces.
North- and east-facing street windows are where café style shines in the Valley: eye-level privacy, gentle morning light, no afternoon penalty. West- and south-facing rooms almost always want the full coverage - full height, with a divider rail if you want independent top-and-bottom control, or tier-on-tier if you want the top panels to open fully. And on the hardest window in the house, style picks second: the west window gets the heat plan first.
Whichever style fits, the material question stays the same - these configurations are available across our Sanctuary poly and Normandy wood lines, and your designer confirms the right build for each specific window, so you never trade durability for a look.