I'm in fairly the same boat. I have internship offers from Deloitte and EY. Both are in the same Summer. I really can't make my decision. Personally, I think that for internships and externships, there isn't much to consider in the short-term of our internships besides salary and communication/culture of each company. In the end, all accounting work is the same, same laws and regulations to follow, same work, same duties. The only things different is the salary, culture, and opportunity for growth. All of the mid-sized and B4 offer you a full-time offer after your internship, considering this we have to also think about how comfortable we would feel working in that company in the long-run or if we can't see ourselves working there in the future, it might also be a thought to consider.