This "reference point" will impact the dates of your daśā periods.
The tradition is to use the Moon.
I prefer the Ascendant.
I leave the choice to you, or you can compare both.
Ayanāṁśa also affects the dates very slightly,
except with unusual ayanāṁśa (re: Vault of Heavens).
This report uses the standard "lahiri" citrapakṣa.
The definition of "year" also affects the dates. This report uses Phaldīpikā's definition (365.24 days).