When comparing TotalTerminal vs Disk Inventory X, the Slant community recommends TotalTerminal for most people. In the question“What are the best power user tools for macOS?” TotalTerminal is ranked 20th while Disk Inventory X is ranked 52nd. The most important reason people chose TotalTerminal is:
TotalTerminal is a plugin for Terminal.app. It provides persistent Visor Window which slides down when you press a hot-key.
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Pros
Pro Allows quick access to the terminal system-wide
TotalTerminal is a plugin for Terminal.app. It provides persistent Visor Window which slides down when you press a hot-key.
Pro Quake style window show/hide
You maybe know or don't know Quake from Id Software. But this game had the best idea to hide/show a terminal window. Simply using full width but 26 rows. On show the widow slid down from top of screen. On hide it mode up to top edge of the screen until it disappeared. 2nd next best was the semi translucent background. You could still see through the terminal window while it was shown.
The same style is now available in TotalTerminal and iTerm2 (OSX Terminal replacement - no Terminal plugin).
Pro Free & Open Source
It is absolutely free and released under the GPL.
Pro Works in High Sierra and above
Pro Allows ordering disk by size
This way you can find what is taking most of the space.
Pro Offers choice between analyzing whole disk or just a specific folder
Pro Absolutely matching with Windirstat
Cons
Con No longer under active development
Con Doesn't work on El Capitan with SIP on
Apple introduced a new security feature in OSX El Capitan, called System Integrity Protection, that, among other things, does not allow augmenting Terminal. While it's possible to turn SIP off (instructions on how to turn off SIP and get TotalTerminal working on El Capitan can be found here) it is not recommended.
Con Crashes on Ventura, when closing the app
But you do not need it so often, so it is ok.
Con Crashes on Sierra
Crashes on Sierra when resizing windows.