A question on power supply for a sensor
1) The second power supply has to be SMPS, deducing from the size, efficiency and auto-select AC input.

2) The second power supply is also double/reinforced insulated meeting relevant safety standards.

3) Don't see anything special about the first one. With a quick glance, the spec of the second one is better. Example: Second one - 50mVpp ripple vs. first one - 40mVRMS (translate to either 70mVpp or 140mVpp, I am not sure).