Ola cab service is just awesome. As you have an app, and you just need to select pick up and drop location. Its so easy to use as in one tap you can book a cab. Plus you have options to choose the cab according to your budget.
You can even book the cabs for later times, like atidnight 2am or something, if you have a train or flight to catch up, you can feel free as you have already booked a cab.
The peak time charges are comparably more.
As soon as you make the booking you get the contract info of the driver and you can tell him the directions if needed, else you can also send him the map directions.
You have a wallet called ola money, which is so convinient, as if you are not carring money, you can pay through it directly and get Cashback and other exciting options.
After the ride you get the option to rate the ride, make complaints, if any or any other issues which are very easily solved . So I think OLA is the most reliable taxi service.