This is another question we get a lot. Its a simple question that can be summed up with one word preference!
There are many brands of waxes out there chap stick type (soft), reg string wax (hard) and so on. But its still preference!
Simply put you don’t need much wax on your bow string and the sole purpose is to protect you string from the elements.
So whatever you use apply it properly and you will be all set.
Do you need to know how to wax a string check this link out https://www.bowstringdepot.com/waxing-a-bow-string/