The Hyundai Venue is a newer car in comparison to the Kia Sonet, which is almost two years old now. Even though the Venue is newer and has new features, the powertrain is the same as the Sonet. So, performance-wise, you won't be gaining much with the Venue. Since your use is primarily in the city, a good automatic gearbox is important, and both the Sonet and Venue get a DCT gearbox that is not the smoothest.
If you are open to trying other options, the Mahindra XUV 3XO is a good alternative, as you get the same feature list but with a smoother torque converter automatic gearbox. The AX5 trim would be in your budget and is worth checking out. 
