Feature Branching vs Trunk-Based Development: A Data-Driven Comparison

The Question Every Team Faces You're scaling your engineering team. Do you stick with feature branches, or switch to trunk-based development? This isn't a religious debate—it's an engineering tradeoff with measurable consequences. Feature Branching Feature branches give each developer an isolated sandbox: git checkout -b feature/user-authentication # work for 2 weeks git push origin feature/user-authentication # open PR, wait for review, merge Advantages: Code review before merge Isolated development Easy to abandon failed experiments Works well with GitHub/GitLab PR workflows The hidden cost: The longer a branch lives, the worse the merge gets. After two weeks, you're not merging code—you're resolving conflicts. Merge hell timeline: Day 1: 0 conflicts Day 3: 2 conflicts Day 7: 12 conflicts Day 14: "I'm rewriting it from scratch" Trunk-Based Development Everyone commits to main multiple times per day: git checkout main git pull # make small change git commit -m "add null check to user