When comparing PuTTY vs Shell NGN - Web Based SSH Client, the Slant community recommends PuTTY for most people. In the question“What are the best SSH clients for Windows?” PuTTY is ranked 2nd while Shell NGN - Web Based SSH Client 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 SSH & SFTP in your browser
Since this tool is cloud-based, there's no need to download and install anything. You can simpy run it from the browser.
Pro Always up to date
Pro Tunnel support
Pro Your devices are available on any device
Pro Telnet Support
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 Lack of configurability
Not enough options to trim it to your needs.
Con Sluggish output
It's ok for a quick session, but compared to native apps it's output is slow.