The zodiac difference in one minute
Both systems divide the sky into twelve signs, but they start from a different point. The tropical zodiac pins Aries to the spring season; the sidereal zodiac pins it to the actual stars. The two have drifted about 24 degrees over two thousand years — which is why a 'Leo' in Western astrology can be a 'Cancer' moon in Vedic.
What each system is best at
Vedic astrology is great at timing — the dasha system gives a period-by-period map of your life, and moon-sign transits drive rashifal. Western astrology is great at personality — your nature, growth and long cycles. Many readers — and Astrologer Inside itself — use Vedic for timing and Western for character.
So which should you read?
Read both, for different needs. For 'who am I becoming', start with your Western chart. For 'when will things move', check your Vedic dasha and transits. Astrologer Inside makes both charts from the same birth details, so you never have to pick a side.