The calculation options influence the calculation results and should therefore be handled carefully. Parts of the options (e.g. ephemeris time option) are pure research features and should not be used for standard calculation.
The difference between UT and ET can be about one minute of time.
The ephemeris time option can be used to compare the data of Maitreya with standard ephemeris data, e.g. Rosicrucian Ephemeris.
It is recommended to use UT for astrological calculations. ET option is a research feature.
Difference between normal and topocentric coordinates can be up to 1 degree for the Moon. So this option has big influence e.g. on Dasa calculations.
Note: The software only takes into account the longitude and latitude of the birth place. The altitude of the location is neglected. This may give an error of about 2 seconds of arc.
The difference between apparent and true positions is quite small.
Most astrologers (and ephemerids) use apparent positions.