When comparing Remmina vs kitty, the Slant community recommends kitty for most people. In the question“What are the best SSH clients for UNIX-like systems?” kitty is ranked 7th while Remmina is ranked 8th. The most important reason people chose kitty is:
Very elegant keyboard shortcuts for creating and navigating between tiled terminals within each tab with no appreciable lag.
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Pros
Pro Straightforward user interface
It's easy and fast to find what you want, nice for daily use.
Pro Supports multiple remote desktop protocols
Remmina supports a number of protocols for accessing remote desktops - RDP, SSH, XDMCP, NX, and SPICE.
Pro You can manually adjust the quality of connection
To more effectively manage the available bandwidth, you can change the speed of your connection. This lets you sacrifice some of the quality of multimedia in favor of more speed.
Pro All connections are organized in groups
All connection profiles can be neatly organized into groups, making managing a large of machines simple.
Pro Window tiling
Very elegant keyboard shortcuts for creating and navigating between tiled terminals within each tab with no appreciable lag.
Pro Extensible Kitten framework
Supports plugins to add features one at a time for those who need them. Examples include Unicode input and side-by-side diffs.
Pro Tabs for multiple instances
Operate several terminals from one window using the tabs feature, allowing you to make simultaneous connections to different remote hosts.
Pro Scrollback buffer viewer
Allows for viewing the scrollback buffer in an external pager of your choice ('less' by default, with support for 'more' and 'most'), a huge benefit for turning actions taken in a live terminal session into a script for efficiency or dissemination or collaborating on workflows.
Pro Controlled and configured from the shell prompt within the program itself
No graphical menus to clutter the screen saves system resources and time once you learn that all those options are still available from the command line within the app.
Cons
Con No RDP server, only client
Remmina is only a remote client (VNC, RDP). It has no server features.