Is the 42-inch S90H good for gaming?

Yes. It has a high refresh rate panel, low input lag and gaming settings such as variable refresh rate support. The small size suits a desk or a close seating distance.

How does it compare with LG's 42-inch OLED?

Both use OLED panels with deep blacks. Samsung's QD-OLED adds stronger color volume, while LG's set is known for slightly brighter full-screen output and a different smart platform.

Is OLED brightness a problem in a bright room?

It can be. OLED sets dim on large bright scenes and reflect light more than matte LED-LCD panels. In a sunny room, a bright LED-LCD TV may hold up better.

Does it support wall mounting?

Yes. It uses a standard VESA mount, so most wall brackets fit. Check the bracket's weight rating, since OLED panels are thin and light but not rugged.

The TV, a stand, a remote and a power cable. HDMI and other cables are not included, so plan for those separately.

Is the 42-inch size enough for a living room?

For seating within about six to eight feet it works well. For a large room with a long viewing distance, a bigger screen gives a more immersive picture.