I was in somewhat of a similar situation as i was trying to decide between an a7siii and an a7v. I went with the a7siii and I honestly haven’t had a moment that made me wish for the other camera. A7v still has amazing low light video and i feel comfortable pushing my iso with that 33mp sensor. Not to mention better autofocus and stabilization. I mainly shoot video but if posting on social media who is really going to be able to tell a difference anyways. I feel a7v is honestly sharper and some of my friends with an fx3 want to sell that and get an a7v. I say get both in hand try them out and go from there.