If a domain name you want is taken, are you better off getting the .net version of the domain, or just getting the .com name and putting something like "xxx" or "online" at the end of it?

Theres a domain I want and its so fucking perfect, but its taken by a domain name company that doesnt sell.
So I dont know if I should just throw XXX at the end of it, or Movies, or something, or just buy the .net version.

ty for any opinion on this.