Ime, easier to be the scapegoat, long term.
I'm the scapegoat. My sister is the GC and she lapped it up.
I hated it for years, felt so angry - it was always my sister given this, invited there, included in xyz. She behaved absolutely appallingly on multiple occasions and was forgiven within hours. I was given silent treatment and shitty looks for days if I did the smallest thing to piss mum off. Always blamed, always bitched about, always judged.
Time has made me glad to be the scapegoat. My sister is still GC.
Whilst I grew up, moved out, put a bit of emotional distance in place and created my own family, my sister stayed close and stayed living at home - she had it too good to ever leave. She's now in a position where my mum has become so dependent on her and has rapidly failing health that she's semi-carer for her.
We're not NC and my sister has improved massively over the years, behaviour wise - and we get on quite well now, despite her still being GC. I learned how to handle my mum about ten years ago and since she realised her silences, blame and withdrawal had zero effect on me anymore, she's also far better and I have a cordial relationship with her, as do the dc.
But I haven't forgotten and it's very much a reap what you sow situation. My sister is reaping it in spades as she's essentially stuck with mum, whilst I get on with my life and help out a polite, minimal amount only.