APY offers a guaranteed pension, but it doesn't keep up with inflation. NPS is market-linked, offering better growth to beat rising costs.
From a tax perspective, the Old Regime is the best option: you can deduct up to ₹1.5 lakh for both, plus an extra ₹50,000 exclusively for NPS. In the New Regime, you lose these personal deductions, but employer contributions remain tax-free. Use APY for basic safety, but choose NPS for better returns and higher tax savings.