I’d look for something that helps with both glare and heat, because that is usually the real problem in rooms with strong afternoon sun. A window covering may look fine, but if the room still feels too bright, too warm, or annoying to sit in, it is not the right choice.
You should pay more attention to how the room feels in the late afternoon than how the product looks on its own. If sunlight hits the sofa, the TV, or your desk every day, that should shape the decision. Privacy can matter too, but in these rooms the bigger issue is often comfort.
I was comparing local options and came across this site while looking into what works in hot, sunny rooms. That gave me a better sense of what to pay attention to before choosing anything.