When comparing OpenSSH vs Ásbrú Connection Manager, the Slant community recommends OpenSSH for most people. In the question“What are the best SSH clients for Linux?” OpenSSH is ranked 1st while Ásbrú Connection Manager is ranked 5th.
Ranked in these QuestionsQuestion Ranking
Pro One of the most trustworthy development teams on the web
Pro The reference
If you find samples or tutorials about SSH, they almost always refer to OpenSSH.
Pro Standard implementation that documentation for all other tools assumes you have installed already
A lot of other tools (e.g. git) are based on this for file transfer.
Pro Split-display support
Built-in support to split a single tabbed connection display into upper/lower or left/right halves as well as quartered. No need to use tmux, screen or the like.
Pro Local terminal tab
Easy access to the local machine's command-line interface is provided by a dedicated tab shown adjacent to the tabs for all remote connections.
Pro Tray icon
Application can be minimized or closed to a tray icon to free up taskbar real estate during background operations.
Pro Wake-on-LAN support
Offers the ability to send a properly formatted "wake-up" packet to a device in the event that it is powered off so that a remote connection can be established.
Pro KeePassX integration
Authentication credentials and SSH keyfile passphrases can be supplied by KeePassX rather than being saved in the application's settings.
Pro Scripting support with custom triggers
Most actions that can be performed over SSH can be scripted and set to run on a schedule, automatically upon connection, or in response to a received message or prompt.
Pro Per-connection proxy settings
Use different proxies for different simultaneous remote host connections if desired
Pro Many supported protocols
SSH1/2, Mosh, FTP, SFTP, VNC, RDP, Telnet, Serial, WebDAV, and IBM 3270/5250
Pro History sidebar
All terminals have a command history of some sort, but this is the only one I've seen with a panel on the side that lists it right before your eyes, and allows you to click on any command you see there and have it instantly filled in on the current prompt line for revision or re-execution.
Pro Logical grouping of connections
Groups and subgroups can be created, and connections put in them, to organize a large amount of connections so that you can get more done with the program
If you were looking for this feature from SecureCRT, it's here
Con Command line tool
It can be difficult to use from a command line interface.