Is QLED better than regular LED?

Yes for color. The quantum-dot layer widens and brightens color, while the backlight and panel are otherwise similar. It is not the same as OLED.

How does it compare with OLED?

OLED wins on black levels, contrast and viewing angles. A QLED set like this one is brighter and has no burn-in risk, which suits bright rooms and varied content.

Do I need a streaming stick?

No. The smart platform is built in, so apps run on the TV itself. A stick is only useful if an app you want is missing.

Is 55 inches right for my room?

For 4K, a viewing distance of roughly 5 to 7 feet suits a 55-inch screen. Measure the wall or stand first, since the set plus bezel is wider than the screen alone.

What should I check before buying?

Confirm the backlight type (full-array local dimming gives better contrast than edge-lit), the HDMI version and count, and whether the stand fits your furniture.