Intellij IDEA vs Sublime Merge

There is a free community edition (open source) and an ultimate edition, which you can compare here.

The ultimate edition is available for free for one year for students but must be registered through an .edu e-mail account.

Uses a fast indexing technique to provide contextual hints (auto-completion, available object members, import suggestions).
On-the-fly code analysis to detect errors and propose refactorization.

IDEA has a clean, intuitive interface with some customization available (such as the Darcula theme).

IntelliJ IDEA hardly ever crashes or has any issues that plague other Java IDEs like file corruption or slowness.

IntelliJ supports many languages besides Java, some of these are: golang, Scala, Clojure, Groovy, Bash, etc...

IDEA places an emphasis in safe refactoring, offering a variety of features to make this possible for a variety of languages.
These features include safe delete, type migration and replacing method code duplicates.

Many plugins are available for almost any task a developer may need to cover. Plugins are developed by Jetbrains themselves or by 3rd parties through the SDK available for writing them.

A very complete development environment support.

The documentation is exhaustive, easy to navigate, and clearly worded.

With ability to step into a certain part of a large method invocation (Shift+F7), drop frame, executing code snippets, showing method return values, etc.

These simplify the daily work, e.g. copy/cut a whole line without the need to select it.

All actions are real Git actions which minimizes confusion and makes it perfect for beginners and professionals alike.

Nothing is faster. I used to use Gitkraken, but on large projects Gitkraken is barely usable.

All actions have either direct hotkeys or corresponding entries in the palette (same as Sublime Text). This means a very streamlined and fast usage.

No account- or server checkbacks (only for updates). All password handling is pure Git which means much less trouble and confusion.

Windows portable version.

Very good performance.

Sublime Merge may be downloaded and evaluated for free, however, a license must be purchased for continued use. There is no enforced time limit for the evaluation.

The product is paid but you can test for your life without paying (similar to sublime text).

The user interface is designed excellently, and it's really fast to navigate with mouse or keyboard. It's never obscured which git commands are used, and commands can be modified/extended if desired. The visual appearance of the interface can be changed via themes, new git commands can be added, and even the menus can be extended.

A license gives you 3 years of updates, and you can use the product after that indefinitely.