Need expert advice to choose between monoblock pump or submersible pump

We have dug a borewell in the last week of May this year. We started getting wet soil from 80 feet and we dug upto 150 feet. Borewell person told that there would be enough water. Currently we are using 1/2 hp monoblock pump from old borewell and fetching water from 60 feet and we get full flow of water upto 3 minutes. I am confused and not able to decide between monoblock pump or submersible pump. Can you please suggest which water pump I should go for?

Regards,

Amit

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