| Field | Xcode 9.1 | Xcode 9.0.1 | Diff |
|---|---|---|---|
| Release type | stable | stable | same |
| Edition | - | - | same |
| Release date | 2017-10-31 | 2017-10-15 | different |
| Minimum macOS | 10.12.6 | 10.12.6 | same |
| Swift | 4.0.2 | 4.0 | different |
| iOS SDK | unknown | unknown | same |
| Build | 9B55 | 9A1004 | different |
建议：如果你是生产环境主力开发，优先选择 stable 版本；如需验证新 SDK，再考虑 beta。