I have not driven 3xo. if you are buying Nexon then it should be Diesel, because petrol average is 12. If you are considering petrol than brezza can be a better option
Agar aap petrol car lena chahte ho to brezza behatar option hoga. Kyuki 3xo aur Nexon petrol cars bohut peeti hai. Agar aap diesel lerahe ho to Nexon is the best.
I have driven both, brezza has softer ride compared to 3xo and better mileage where as 3xo have more features performance and much nicer interior but waiting time is too long