We appreciate your choice as the Baleno is an astonishing car.The Baleno Alpha gets a 1.2 litre BS IV compliant engine whereas the upcoming Toyota Glanza is expected to get BSVI engine options. Maruti has just launched Baleno with a new BSVI compliant Dura jet 1.2-litre petrol engine. If you are looking for a long term use car you can even check the Baleno with BSVI compliant engine. The BSIV engines will not be available on the cars after April 2020.
Toyota Glanza received a 1.2-litre petrol mild hybrid MT engine with the fuel efficiency of 23.87km/l. Glanza received the same engine from Maruti which is used in Baleno. Please follow the below link for more information: https://www.zigwheels.com/news-features/news/toyota-glanza-launched-in-india-prices-start-at-rs-721-lakh/34062/