1920 × 1080 vs 2560 × 1440
Full HD 1080p against QHD 1440p, side by side.
2560×1440 renders 1,612,800 more pixels than 1920×1080 — 78% more. Both are 16:9 displays, so content fits identically — the difference is pure pixel density.
The classic PC upgrade question, and QHD usually wins. At 27 inches, 1080p looks noticeably soft while 1440p is the sweet spot — sharper text with no scaling tricks, and 78% more pixels that midrange graphics cards can now drive at high frame rates. Stay at 1080p only if your GPU is older or your monitor is 24 inches or smaller.