AIO Boot can help you create a bootable USB with Grub2, Grub4dos, Syslinux, Clover, and rEFInd as well as boot Windows and most Linux distributions.
AIO Boot goal was to address the fact that there are many USB boot tools but not many that give you numerous options of what operating system you'd like to boot with. Many techs will like the many options you have here depending on what you need.