When comparing Tails vs Funtoo (portage based), the Slant community recommends Tails for most people. In the question“What are the best Linux distributions for desktops?” Tails is ranked 21st while Funtoo (portage based) is ranked 31st.
Ranked in these QuestionsQuestion Ranking
Pro Privacy focused
Pro Has TOR built-in
Use the Internet anonymously and circumvent censorship; all connections to the Internet are forced to go through the Tor network.
Pro Like Gentoo but more streamlined
The profile system improves portage's usability without losing the soul of Gentoo.
Pro No systemd
Still allowing one to run, for example, full desktop environment such as Gnome 3.20.
Pro Portage tree split into kits
This allows more fine-grained control over package updates, and packages can be now tied together inside the kit to minimize dependency breakage while upgrading.
Pro Use flags that are suitable for a task or environment are grouped into Profiles
It allows selecting, for example, gnome or desktop profile with most of the sane use flags enabled inside the profile.
Pro Stage3 archive coming with pre-compiled kernel based on Debian's kernel
Pro Simpler template-based network configuration
Pro `boot-update` to take care of bootloader configuration
A tool to update your grub config.
Pro Funtoo Linux offers a variety of stage3 builds
Customized to a variety of CPU microarchitecture variants from AMD, ARM, and Intel.
Pro Stage3 sources are built using the Funtoo Linux tool 'metro'
It's a sophisticated replacement for Gentoo's build tool 'catalyst'.
Con Not for daily use
Tails is a privacy focused Linux distro. The updates that you will receive are only for improving privacy and not for improving user experience.
Con Saved states are not present for security
For security reasons, saved states are not supported in Tails. Files can be stored in a separate, persistent volume which must be accessed with a root password. Personal settings (e.g. -- keyboard layout, window settings, etc.) are not saved persistently across reboots. This can be a hindrance for anyone not using English as their language, or not using a QWERTY keyboard layout.
Con You can't install it to a hard drive
Con Slow internet
Tails uses the TOR network and as a result the internet on your computer will be very slow.