2560 × 1080 vs 3440 × 1440
UltraWide FHD against UltraWide QHD, side by side.
3440×1440 renders 2,188,800 more pixels than 2560×1080 — 79% more. Both are 21:9 displays, so content fits identically — the difference is pure pixel density.
Both are 21:9, but they're a class apart. At the typical 34 inches, 2560×1080 drops to a coarse 81 PPI — fine at 29 inches, fuzzy beyond it — while 3440×1440 keeps text crisp. The entry ultrawide is a cheap way to try the shape; if the budget allows, 3440×1440 is the one you'll keep.