Which tax regime best for 20LPA salary?

You can do some research to understand both the regimes before blindly asking this question. Check this link from cleartax: https://cleartax.in/s/old-tax-regime-vs-new-tax-regime

New Tax Regime hands down if you don't have a house loan.

Ask some CA u know . They would say old.

Bro i am a CA. Forget numbers let me tell u new regime is a trap. Invest your money take all deduction and be in old regime