1440 × 900 vs 1920 × 1200
WXGA+ against WUXGA, side by side.
1920×1200 renders 1,008,000 more pixels than 1440×900 — 78% more. Both are 16:10 displays, so content fits identically — the difference is pure pixel density.
Same 16:10 shape, 78% more pixels. 1440×900 belongs to mid-2000s hardware — if you're still on one, any modern 1920×1200 panel is a generational jump in both space and sharpness. There's no scenario where new hardware should choose the smaller one.