Git Merge vs. Rebase: Comparison and Use Cases

1. What is a Git Merge? (The Timeline preserver)

When you merge a feature branch into main, Git creates a Merge Commit.

Pros: It is non-destructive. The existing branches are not changed in any way. It preserves the "True History" of when work happened.
Cons: It creates "Merge Commits" which can clutter up your history with messages like "Merge branch 'feature-x' into main."

2. What is a Git Rebase? (The Storyteller)

Rebase "Moves" the entire feature branch so it starts from the tip of the main branch. It effectively "Rewrites" history.

Pros: It eliminates unnecessary merge commits. Your history looks like a single straight line, making it much easier to read.
Cons: It is "Destructive." You are literally deleting old commits and creating new ones.

[!CAUTION] Cardinal Rule of Rebasing: Never rebase a branch that you have already pushed to GitHub (Public Branch). It will break the project for everyone else.

3. The Comparison Table

Feature	Git Merge	Git Rebase
History	Chronological (Messy)	Linear (Clean)
Simplicity	Easy - no rewriting.	Harder - requires force pushing.
Traceability	Perfect - shows every branch.	Obscured - makes branches look local.
Use Case	Shared team branches.	Local feature branches before PR.

4. The Professional Workflow: The Combo

Most expert teams use a combination of both:

Rebase Locally: While working on a feature, rebase regularly against main to keep your branch clean and up-to-date.
Merge for Pull Requests: When the feature is done, use a "Merge" (or "Squash and Merge") to integrate it into main so the team can see when the feature was officially added.

Frequently Asked Questions

Does Rebasing cause more conflicts? No, it just changes When you see the conflicts. In a rebase, you resolve conflicts commit-by-commit, which is actually easier than resolving one giant merge conflict at the end.

What is 'Interactive Rebase'? The git rebase -i command allows you to edit, delete, or merge ("Squash") your local commits before anyone else sees them. It is the ultimate tool for "Polishing" your work before a final review.

Key Takeaway

Merging and Rebasing are two sides of the same coin. By understanding the trade-off between "History Truth" and "History Clarity," you can maintain a Git log that is as useful for debugging as it is for reading.

Part of the GitHub Mastery Course — masters of history.