Given your requirements and your budget of ₹6 lakh, you're right, the Maruti Suzuki Alto K10 and S-Presso are your best options. Both of these Maruti Suzuki cars use the same engine and gearboxes, and offer the same hassle-free driving experience.
Of the two, the Alto K10 has the advantage of offering six airbags as standard across the range, while the S-Presso only gets two. However, the Maruti Suzuki S-Presso offers more interior space, should you travel with passengers often.
You could also consider the Maruti Suzuki Celerio. You might only get a mid-range variant in your budget, but it offers more space and a more upmarket feel than the Alto and S-Presso.
