While the Maruti Suzuki Brezza and Grand Vitara essentially belong to different segments, there is a price overlap. Without more details, we assume you are considering like-priced models of the duo. From the Grand Vitara line-up, that means the standard 1.5-litre petrol engine, which, incidentally, is shared with the Brezza. While the larger Maruti Suzuki Grand Vitara does have a more upmarket air about it, we'd feel that opting for a better-equipped version of the Brezza would be a better use of your money. For reference, for the same money that you could get a fully-loaded Brezza ZXI Plus, you'll get a mid-spec Grand Vitara. The added features on the Brezza do count for a lot and your experience with the car. What also strengthens the Brezza's case is that, despite being a smaller vehicle, it feels airier than the Grand Vitara at the back. In terms of performance, there is little real-world difference, since both models use the same engine.
If you live in a city and drive often on congested roads, an automatic would be the one we'd recommend. That said, manual gearbox versions of the Brezza and Grand Vitara are easy to live with too, thanks to their light clutches and smooth gearshifts.