Here is the honest answer to the ₹500 question, before the rankings: nothing genuinely good is sold below ₹500 in India, and the closest thing to a recommendation in that band is the Nova NHT-1046 at around ₹549. It cuts hair, it charges, and it will last you roughly twelve to eighteen months before the uncoated blades dull or the non-replaceable battery gives up. If ₹549 is your ceiling today, that is a legitimate purchase and we rank it on those terms rather than pretending it competes upward.
But the arithmetic deserves one minute of your attention, because it changes the answer for most people. A ₹549 Nova needs replacing in about eighteen months. A ₹949 Philips BT1232 has self-sharpening DuraPower blades rated for four years, a lithium battery, a five-minute quick charge and a claimable two-year warranty. Over four years the Nova costs you roughly ₹1,500 in replacements; the Philips costs ₹949 once. The cheaper trimmer is the more expensive one.
What ₹400 extra buys you specifically: blades that stay sharp instead of dulling, a battery that can be charged in an hour instead of eight, spare combs you can actually buy, and somewhere to take it if it fails. That is why this page ranks the ₹549-₹949 band together rather than pretending the sub-₹500 shelf has depth it does not have. Buy at ₹549 because it is your ceiling — not because it is good value, which it is not.