I am happy that we have finally broken the hoodoo of 'never having won a test series in Australia', but for me, the 2001 test series win against Australia in India IS GREATER THAN the 2018 test series win against Australia in Australia
Reasons:
1) In 2001, India were massively affected by the match fixing saga and were rebuilding under Ganguly
2) The 2001 Australia side were almost invincible and featured all their biggest stalwarts in one team, including Warne/McGrath/Gilchrist/Waugh Bros/Ponting/Hayden/etc
3) The 2001 Australia side were coming off a '16 consecutive test wins' record and that record was stopped with that sensational Eden Gardens defeat of 2001
This is a good win, but I am not rating it anywhere near the World Cup wins or that 2001 test series win against Australia.