Git Merge vs Rebase: Key Differences, Workflows & When to Use Which
Both commands integrate changes from one branch into another, but they treat commit history completely differently.
Comparison Matrix
| Feature / Criterion | Option A | Option B |
|---|---|---|
| Commit History | Preserves complete branching graph & creates a merge commit | Rewrites commits onto target branch for a clean linear history |
| Safety on Public Branches | 100% safe, never alters existing commit hashes | Dangerous on shared/public branches (rewrites commit SHAs) |
| Conflict Resolution | Resolved in a single merge commit | Resolved commit by commit during the rebase replay |
| Best For | Integrating completed feature branches into main via Pull Requests | Keeping personal local branches up to date with main before PR |
Advantages & Limitations
Key Advantages
- Completely preserves true chronological history
- Zero risk of corrupting teammates' shared branches
- Easy to revert an entire feature branch in one commit
Trade-offs & Pitfalls
- Can clutter commit history with frequent 'Merge branch' commits
- Non-linear commit graphs can be harder to follow
Engineering Verdict & Best Practices
Use git rebase to update your local private feature branch with latest main commits. Use git merge (or GitHub PR Squash/Merge) when merging your completed feature into main.
Frequently Asked Questions
Can I undo a git rebase?
Yes, using git reflog. Find the commit SHA before the rebase started and run 'git reset --hard <SHA>'.
Why is rebasing a public branch dangerous?
Rebasing creates new commit SHAs for existing commits. If teammates have pulled the old commits, their local history will diverge, creating chaos.
Other Comparisons
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