I'm new the to forum as well but I've bought some of Birgir's amps in the past and have gained from the knowledge here.
I've played this game of asking if A is ''better'' than B on the internet and it is pretty useless.
I have a possible solution for you.
Find a Hifiman dealer in the EU who will lend you the Susvara for a few days. In my experience many dealers are ok with this. Of course you'll need to pay full price as a deposit.
Directly compare the Susvara to the 009 in your system and voila you'll have your answer in a few days. No need to waste time reading 500+ pages of babble on Headfi.
Instead spend more time with your family, watching a movie whatever
I've started doing this and it is much better than wasting time on bullshit reviews.
I borrowed a Raal SR1a from a dealer, found that I liked my Utopia better. Then I borrowed an SR009 from a friend. Found that I liked the 009 a bit better than the Utopia.
Now I have an 009S on order
As a matter of principle I have avoided Hifiman's headphones as the founder seems to have zero respect for his customers. I'll probably borrow a Susvara out of curiosity but would never buy them.
He pulls his prices out of thin air as a dick waving exercise nothing more. I guess his home market like high prices as a marker of quality.
All the best.