Egg freezing before excision surgery?

Hello, I am 28F and I have suspected stage 4 endo with big endometriomas on each ovary. My excision surgery is scheduled for next months. However, I did see a fertility specialist that recommended to do egg freezing before the excision surgery, and when I discussed that with the endo surgeon he told me that he believes excision surgery should be the first step. And now I'm really confused on what to do. I am almost asymptomatic and my main concern is fertility.