I'm gonna have to differ on the group selections mentioned earlier.
SRAM shifting is not as great as you make it seem nor is that much
betters. For starters not everyone is a fan of their push/push
shifting system and shimano offers both push/pull and push/push on
their shifter pods.

Also I'm not sure where you got your 500g less number from but I can
assure you no similarly priced SRAM group compared shaman is 500g
less. The SRAM x-0 vs shaman xtr is def not 500g lighter. Not to
mention the price tag alone on a replacement x-0 cassette makes the
SRAM system pointless in my book.

From an AM/DH perspective I laugh when you see bikes running the same
lightweight compents as cross country bikes ... SRAM has yet to come
out with a SAINT rival group.

And sure the XX group from SRAM might be the lightest group put there
and the only 2x10 for mtb but the new xtr will change that ... And
still let users decoded between 2 or 3 gears up front.