Which pump is better - for low amount of water below the water table- Jet or Submersible

We can install Jet or Submersible pump in our area. 

In summers, the water table goes down and I have been told by our technician that Jet pump will be better in this condition as the submersible will not work properly if the water table is very low. Pls clarify the above because we face the problems with submersible pumps in summers very badly and we are planning to use Jet Pumps.

Thank you