@obscurosaur @anivar

Not too much difference in the pricing.

HDFC Bank NEFT charges -

Upto Rs 1 Lakh - Rs 2 + GST
Above Rs 1 Lakh - Rs 10 + GST

IMPS
Above Rs.1 to Rs 1 Lakh - Rs.5 + GST
Above 1 lakh to 2 Lakh - Rs.15 + GST

From @logic

You are involving a 3rd party NPCI in the process. NEFT has faster auto reversals on failed transactions (2 days) as against IMPS (7 days). NEFT is faster among large banks, largely same day, sometimes even same hour, as against instant IMPS.