They can all serve the same purpose. The advantages of 7zip are the following:
- It is totally free (as both in free beer and free speach)
- The 7z compression format is superior to rar because it can compress either more or faster (not both though)
- The rar format is proprietary. You are free to decompress but not to compress. In a business setting, you could theoretically get in trouble if you don’t have a license. In some countries, e.g. USA, even outside a business setting. But if you have been using winrar forever, I can’t see you changing your ways anytime soon! :)
I don’t get the same impression in my community. I’m pretty sure that we all love capitalism in “millionairs@lemmy.lm” What communities do you waste your time on?