I have been using freecharge for quite some time.
Services offers - Mobile recharge, DTH bill payment, electricity bill payment.
Special advantage on freecharge is that users can pick up free coupons of various brands for an amount equal to their recharge amount FREE of charge. They offer many discount coupons of various merchants like clothing, restaurants, accessories and more. This is like an icing on the cake.
Recharge time - Everytime I have recharged my mobile balance, it has been done on time and when once the transaction failed, money was instantly credited in my freecharge wallet.
Why freecharge - Because it offers various discount coupons and apart from that it runs many offers at various times like 50 cashback on 50 rs. recharge which every user will love.
User interface - The website & app user interface is very user-friendly and recharging is very easy through it.
I will recommend you to try it once as it is worth it. I use only freecharge for my recharges.