Bridal Party Stress… should i appease my family or go with my gut?

Good morning all!
I’m a March 2024 bride and am in the process of choosing my bridal party. I’ve been engaged since COVID-19 started in 2020 and, due to struggles of the pandemic as well as various life challenges, I am just now buckling down on wedding planning.

Just a little background on my fiancé and I- we’ve been together for about 4 and a half years. We met in 2019 in our hometown and fell in love pretty quickly. About 6 months later, in a leap of faith, my fiancé (then-boyfriend) and I moved 5 states away together when I got accepted to a grad school program I worked super hard to get into. I come from a very traditional family and they were NOT happy at the idea of me living with a guy… much less moving 500+ miles away from home. We recently moved back home after about 3 years of living away from our family and friends and it’s been a challenge getting my family to put their emotions aside and accept the man I fell in love with, though we ARE getting there slowly.
Fast forward to now with wedding planning… in the stress of the past 3 years of my parents not approving of my living with my fiancé, my childhood best friend was my closest confidant and biggest supporter. We’ve known each other for almost 20 years and, though we don’t always talk super often, we have both always been there for each other through life’s up and downs. However, I do have two older sisters who I was close with growing up but they very much sided with my parents in their opinions of my fiancé and I so our relationship has become a bit strained over the past few years.
Now, I understand that choosing a sibling as MOH/BM is the “traditional” way. However, with the last few years in mind, I can’t help but feel like my best friend is deserving of being my maid of honor. Of course, my parents are fighting against this… particularly my mom. I haven’t told them my plans for who I’m choosing for my MOH but she is guilt-tripping me saying my sisters will be really upset if either one or both aren’t chosen as MOH and, as someone who absolutely HATES confrontation, I’m at a loss on how to proceed.
Should I listen to my gut and make my best friend my MOH, or should I appease my family in an effort to help ease tensions between my fiancé and them and give the title to my sisters? Any advice is appreciated!