The most powerful, simple, and flexible panels in Linux

According to my research on the panels used and those I've tested, I've found quite a few panels created for Linux.
But the ones that caught my attention the most are 2 panels:

1- xfce-panel :

This panel is used by default in an Ubuntu variant known as xubuntu (x refers to xfce-panel
Used instead of the Unity theme).
What's nice is that you can use multiple panels, configure the background of the panel, lock it, move it,
put all sorts of applications on it, and even customize a menu according to your needs.

To install it, the simplest way is to use the command: apt-get install xfce4-panel
Or if it's not provided in the distribution, you can download it via the following link:

http://archive.xfce.org/src/xfce/xfce4-panel/4.12/xfce4-panel-4.12.0.tar.bz2

2- wbar :

This panel is one of the favorite panels used for its flexibility and lightness. It doesn't offer as many
parameters as xfce, but in terms of simplicity, it's the best.
To configure the panel, you either need to install wbarconf (recommended),
or simply modify the wbar configuration file in the home folder.
Adding an application is done by:
1-Title (displayed when hovering the mouse below)
2-Command (the necessary command to execute the application)
3-Icon (the path of the image associated with the application)

To install it, the simplest way is to use the command: apt-get install wbar
(this will also install wbarconf automatically)
Or you can use the command:

wget http://wbar.googlecode.com/files/wbar_1.3.3_i386.deb

to download the .deb file and then install it using dpkg or directly via command.

Well, there are others that I've tested, cairo-dock might also be interesting
(but for me, I didn't like it, not recommended for PCs with less than 2 GHz processor).
I'm not claiming perfect results, I might be mistaken.
Please share your thoughts on this article.