in 2010, gli was just a 1300cc car with a manual gearbox but power windows and abs. Altis was the fully loaded model with 1800cc engine, and a list of options like cruise control, air bag, sunroof, leather and automatic gearbox.
A gli is more fuel economical whereas the altis is plain power, resale wise people prefer the gli because it consumes less fuel. this is basically all you need to know.