Maruti Ritz diesel can be termed 'a practical Swift'. If you are concerned about the running cost and the fuel bills stick with diesel. The Facelifted Ritz is going to be launched soon.
Honda Brio will get you many features more than what Ritz Diesel VDi may offer. ABS
, Airbags that Brio offers makes it a VFM
When you compare Ritz VDi and Brio and their price consider the fact that Ritz is a diesel hatch and the other is petrol. Its better to compare Ritz ZXi with Honda Brio S(O)MT
I would advice you to first decide whether to go for petrol or diesel.
If you city drive is on the higher side and if you are concerned about your fuel bills go for diesel. But at the same time if you are ready to live with the heavy fuel costs go for petrol.
After all considering your monthly run my suggession is to go for diesel( Car's EMI + Fuel Bills=Bigger Burden; conditional budget is constraint)
Do wait for the new Ritz or consider other hatches such as Ford Figo , Toyota Liva etc which are close competors of Ritz diesel