Best Compressions

1. .tar.xz (Best)

tar -cJvf compressed_file.tar.xz directory_or_file_to_compress

2. 7zip (Best)

7z a -mx9 compressed_file.7z file_or_directory_to_compress

3. RAR

rar a -m5 compressed_file.rar file_or_directory_to_compress

4. XZ

xz -9 filename