When comparing GVim vs Process Hacker, the Slant community recommends Process Hacker for most people. In the question“What are the best power user tools for Windows?” Process Hacker is ranked 8th while GVim is ranked 28th.
Ranked in these QuestionsQuestion Ranking
Pros
Pro Vim without a shell
When opening files from the file manager, it is still nice to have vim.
Pro Excellent performance
Because it loads the whole file into RAM, replacing all string occurences in 100MB+ files is quick and easy. Every other editor sort of died during that.
Pro Works on all platforms
Whether its your windows machine, a Linux, Unix or a Mac Vim would work everywhere. You can even build it from its source on your favorite linux environment.
Pro Has different cursor shape in command and insert modes
Unlike vim, gvim has different cursor shape in command and insert mode, which is very convenient.
Pro Supports all vim features and settings
All vim features, custom settings, and plugins are automatically available.

Pro See programs with active network connections

Pro Real-time information on disk access
Pro Can be set as your default task manager
Pro 10x more detail and information about usage of PC resources and processes

Pro Detailed overview of system activity with highlighting

Pro Can create, edit and control services

Pro Can track which processes are using a file

Pro Open source
You can find the code here.

Pro View detailed stack traces with kernel-mode
Supports WOW64 and .NET.

Pro Graphs and statistics to quickly track down resource hogs and runaway processes
Cons
Con GVim, like Vim, has a difficult learning curve
A lot of time is needed to learn all the commands and modes supported. A lot of time will also be spent tuning all the settings to the user's preference.
Con It might be a little intimidating for some users
