I have extensive experience with both and the main benefit Excel has over Google Sheets (in my opinion) is the amount of rows you can handle all at once. With Excel you can manipulate 200k rows easily. The same can not be said with Google sheets due to the fact that it remains a cloud based tool. I found Google sheet to be enough though in 90% of my cases (may change depending on what you usually work on). The scripting ecosystem google sheets has is amazing (apps scripts and various python libraries) and is much stronger compared to Excel.