Git vs Other Version Control Systems
Quick Summary
Git dominates version control with 95%+ market share among developers. But it wasn't always this way — and understanding the alternatives helps you appreciate Git's design decisions and know when a different tool might serve you better.
The Evolution of Version Control
timeline
title Version Control Evolution
1972 : SCCS (Source Code Control System) — first VCS
1982 : RCS (Revision Control System) — file-level locking
1990 : CVS (Concurrent Versions System) — multi-user
2000 : SVN (Subversion) — centralized, better than CVS
2005 : Git created by Linus Torvalds — distributed
2005 : Mercurial (hg) — distributed alternative
2008 : GitHub launches — Git goes mainstream
2018 : Microsoft acquires GitHub — Git dominates
Comparison Table
| Feature | Git | SVN | Mercurial | Perforce |
|---|---|---|---|---|
| Architecture | Distributed | Centralized | Distributed | Centralized |
| Speed | Very fast (local ops) | Moderate (network-dependent) | Fast | Fast (streaming) |
| Branching | Lightweight, instant | Copies entire directory tree | Lightweight | Streams/branches |
| Learning Curve | Steep but worth it | Gentle | Moderate | Steep (enterprise) |
| Offline Work | Full capability | Very limited | Full capability | Limited |
| Large Files | Poor (needs LFS) | Better than Git | Similar to Git | Excellent |
| Market Share | ~95% | ~3% (legacy) | ~1% | ~1% (enterprise) |
| Best For | Almost everything | Legacy projects | Simplicity preference | Game dev, large binary |
Git vs SVN (Subversion)
The most common migration path in the industry was SVN → Git.
- Git Advantages
- SVN Advantages
| Advantage | Explanation |
|---|---|
| Offline commits | Commit, branch, and view history without network access |
| Fast branching | Branches are just pointers — created in milliseconds |
| Full history locally | Every clone has complete project history |
| Better merging | Git's merge algorithms handle complex scenarios well |
| Community & tools | GitHub, GitLab, CI/CD integrations everywhere |
| Advantage | Explanation |
|---|---|
| Simpler model | Linear history, no distributed complexity |
| Path-based access control | Restrict access to specific directories |
| Better binary handling | Doesn't bloat with large binary files |
| Partial checkout | Clone only the directories you need |
| Atomic commits | Server-side, single source of truth |
When to Choose SVN Over Git
- Legacy projects with deep SVN integration
- Projects with very large binary assets (without Git LFS)
- Organizations requiring path-level access control
- Teams that prefer a simple, linear workflow
Git vs Mercurial
Mercurial (hg) was created the same month as Git (April 2005) and had a similar distributed design.
| Aspect | Git | Mercurial |
|---|---|---|
| CLI Design | Powerful but inconsistent | Cleaner, more intuitive |
| History rewriting | Full support (rebase, filter-branch) | Discouraged by design |
| Extensions | Built-in features | Plugin-based architecture |
| Performance | Faster on most operations | Comparable, sometimes slower |
| Adoption | Universal | Declining (even Mozilla switched to Git) |
Historical note
Google, Facebook, and Mozilla used Mercurial for years. All have since migrated to Git (or Git-compatible systems), cementing Git as the universal standard.
Why Git Won
Several factors combined to make Git the dominant VCS:
- Linux kernel pedigree — Created by Linus Torvalds, proven on the largest open-source project
- GitHub's launch (2008) — Made Git social, visual, and accessible
- Speed — Fast enough for projects with millions of files
- Flexibility — Supports every workflow (centralized, feature-branch, gitflow, trunk-based)
- Network effects — More users → more tools → more users
- Open source — Free forever, no vendor lock-in
Best Practices
- Learn Git deeply — It's the industry standard; time invested pays off everywhere
- Don't avoid Git because of complexity — Start with basics (
add,commit,push,pull), then layer on advanced features - Use Git LFS for large files — Don't fight Git's weakness; extend it
- Choose tools that complement Git — GitHub Actions, pre-commit hooks, IDE integrations
What's Next
- How Git Works Internally — Understand SHA hashing, objects, and the commit graph
- Installation & Setup — Get Git running on your system