When comparing PuTTY vs Terminus, the Slant community recommends Terminus for most people. In the question“What are the best terminal emulators for Windows?” Terminus is ranked 4th while PuTTY is ranked 7th.
Ranked in these QuestionsQuestion Ranking
Pro De facto standard client for SSH, Telnet and Rlogin
PuTTY is one of the oldest and most popular clients. It has earned the trust of a great number of users over a long period by being reliable, offering useful features and helpful support. It got into the 15 Essential Open Source Tools for Windows Admins list by InfoWorld.
Pro Source code available
Full source available. Compile and modify it yourself.
Pro Lightweight and portable
Doesn't require much resources (memory and hard-disk). Can even be run on a system by just downloading without install.
Pro Can be used on any Windows computer, even without admin rights
Pro It looks just beautiful
Pro It comes with plugins
Pro It's open source
This helps the community to move software forward and to make it even better.
A lot of things can be easily configured, e.g. color theme, size, window frame behavior, tab location, cursor style, hotkeys, etc.
Pro Under active development
Hyper development has basically stalled out.
Pro Is cross-platform
Even the question was "...for Windows", it's nice if you can use your tools over different platforms.
Pro Integrated GitBash, Cmd, PowerShell, and WSL
Con Can not save passwords
Anyway, you can use "PuTTYgen" to generate a key pair, then use "Pageant" to do a password-less SSH remote login.
Con Lacks features
It is JUST an SSH client. There are many other options with built in X-servers, Multitabbing, etc.
Con Ugly design, too simple
Con Tedious logging/tracing
Its tedious to set up logging and tracing (e.g. for serial connections).
Con No global settings
If you want to change a setting for all your connections, you'd have to do it individually.
Con No login scripting
Con Some functions still fail.
It's huge. The amount of resources it consumes is not justifiable.
Con Slow with input lag
Sadly, Electron strikes again. The input lag is noticeable and annoying. Startup also takes like 2 seconds or more (On an i7 from 2016 with SSD).