Which is better for gaming?

The LG C4. It has a 120 Hz panel, VRR and Nvidia G-Sync certification, plus four HDMI ports. The Samsung listing states no refresh rate or gaming features.

Which has the better picture?

Both are OLED, so contrast and viewing angles are strong on either. The LG uses a 2024 Evo panel, which is the newer, brighter generation. The Samsung panel generation is not stated.

Is the Samsung stand worth having?

If you cannot wall mount, yes. The ErgoAV FlexFold frame stand with shelves lets the TV stand free and holds small items. The LG comes with a standard tabletop stand only.

Which is better in a bright room?

Neither has an anti-glare coating listed, and OLED panels reflect light. The LG C4 is explicitly listed as not anti-glare, so plan seating and curtains around reflections on either set.

Should I step up to the LG C4?

Yes if you game or watch a lot of HDR movies. The C4 adds 120 Hz, VRR, G-Sync and four HDMI ports. Pick the Samsung bundle only if the freestanding stand is the deciding factor.

Samsung 80" OLED 4K Smart TV vs LG C4 83" OLED TV

The LG C4 is the stronger TV of the two. It is a 2024 Evo OLED panel with 120 Hz refresh, four HDMI ports, VRR with Nvidia G-Sync certification and full smart TV apps. The Samsung set is a flat 4K OLED at 80 inches and comes bundled with an ErgoAV FlexFold frame stand with shelves, which suits a floor-standing or studio setup. Owners of the C4 consistently praise its picture and gaming features; the Samsung bundle is more about the stand than the panel.

Choose the Samsung bundle if you want a large flat OLED on a freestanding frame stand with shelves and do not need 120 Hz gaming features.
Choose the LG C4 if you want the better-specified 2024 OLED for movies and console gaming, with 120 Hz, VRR and four HDMI inputs.

Prices

Samsung 80" OLED 4K Smart TV: $2,924.99 at Newegg (last seen Nov 10)