Is a 34-inch or 49-inch ultrawide better?

34-inch 21:9 (3440x1440) is the mainstream sweet spot reviewers most often recommend for a single-monitor setup: it fits on a normal desk, most games support 21:9 natively, and a mid-range GPU can drive it. 49-inch 32:9 (5120x1440) is closer to two 27-inch 1440p monitors stitched together, which specialist communities praise for productivity and sim/racing immersion but warn requires a strong GPU and that many games don't fully support 32:9 without black bars.