Raspberry Pi Imager vs UNetbootin

Raspberry Pi Imager writes Raspberry Pi OS and other operating systems to storage media for Raspberry Pi use. It includes popular images, accepts locally stored images, and lets advanced users configure a custom image repository from a file or URL. For supported systems, setup options can set a hostname, time zone, user and Wi-Fi credentials, and remote connectivity; SSH can be enabled with password or public key authentication. After writing, the app checks the image, a step Raspberry Pi recommends completing. It runs on Windows, macOS, and Linux, with Ubuntu and Raspberry Pi OS installation options and AppImage downloads documented for other Linux distributions. Compatible Raspberry Pi models can install an operating system over a wired network without a separate computer or SD card reader. Writing overwrites all data on the chosen storage device, so selecting the destination carefully matters. Anonymous usage telemetry is on by default and can be disabled in App Options. Raspberry Pi publishes the source code publicly and accepts vulnerability reports. The software is free.

UNetbootin creates bootable Live USB drives for Ubuntu and other Linux distributions, allowing installation without burning a CD. It can download a supported distribution or use a Linux ISO already on the computer, and the listed targets are a USB drive or hard disk. Built-in downloads include Ubuntu, Debian, Fedora, Arch Linux, Linux Mint, and FreeBSD, as well as system utilities such as Parted Magic and SystemRescueCD. The site says most Linux ISO files should work, though some require extra boot options or changes, and some cannot boot from USB as-is. Non-Linux operating system ISOs should not be expected to work because they use a different boot mechanism. UNetbootin is available for Linux, macOS, and Windows, and is free; donations are accepted. The source code is available on GitHub under GNU GPL Version 2 or above. Linux download options include an Ubuntu PPA, 32-bit and 64-bit binaries, packages for several distributions, and source code.