When comparing Dash to Dock vs tint2, the Slant community recommends tint2 for most people. In the question“What are the best docks for Linux?” tint2 is ranked 3rd while Dash to Dock is ranked 6th. The most important reason people chose tint2 is:
You can easily tweak the panel and make it very good looking by using tint2-settings.
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Pros
Pro Integrates with GNOME
Dash to Dock is a GNOME extension, so it works on GNOME.
Pro Easy to theme and customize
You can easily tweak the panel and make it very good looking by using tint2-settings.
Pro Lightweight
Very lightweight with minimal resource use. Often used with lightweight window managers.
Pro Feature rich
Despite being lightweight, tint2 provides most options available for system panels including launchers, taskbar, system tray, clock.
Pro Panel as well as dock
Depending on configuration, tint2 can be a panel with taskbar, systemtry, menu, battery etc or as a standalone dock for launchers.
Pro Multi-instant support
Many instances of tint2 can be opened concurrently using different config files.
Pro Works as a simple dock for i3wm
Tiling WMs are great but sometimes the mouse is your friend too! Tint2 can easily be configured as a little dock for i3wm.
Cons
Con GNOME only
Con No intelligent hide option
Tint2 provides autohide option but there's no way to autohide it when windows are maximized or overlap the panel.