TSDF Integration vs RGBD integration

### Checklist

- [X] I have searched for [similar issues](https://github.com/isl-org/Open3D/issues).
- [X] For Python issues, I have tested with the [latest development wheel](http://www.open3d.org/docs/latest/getting_started.html#development-version-pip).
- [X] I have checked the [release documentation](http://www.open3d.org/docs/release/) and the [latest documentation](http://www.open3d.org/docs/latest/) (for `master` branch).

### My Question

Hello,

I tried to ask this question in the [Discussions](https://github.com/isl-org/Open3D/discussions/5722#discussion-4590657) section, but unfortunately I didn't get any response. First of all, thank you very much for providing this very interesting library. The documentation for TSDF and RGBD integration is a bit misleading to me: I noticed that to fuse RGB-D images Open3D has 2 different tutorials: one for [TSDF Integration](http://www.open3d.org/docs/latest/tutorial/t_reconstruction_system/integration.html) and one for [RGBD integration](http://www.open3d.org/docs/latest/tutorial/pipelines/rgbd_integration.html). I can see that in RGBD integration, TSDF volume integration is used via ScalableTSDFVolume. However, in TSDF integration it seems that [Voxel Block Grid](http://www.open3d.org/docs/latest/tutorial/t_reconstruction_system/voxel_block_grid.html#voxel-block-grid) is used. Are they using the similar thing? Is there any difference between these two in terms of accuracy vs performance? For example, can I say that [TSDF Integration](http://www.open3d.org/docs/latest/tutorial/t_reconstruction_system/integration.html) is for fast/online 3D reconstruction application and [RGBD integration](http://www.open3d.org/docs/latest/tutorial/pipelines/rgbd_integration.html) is for offline/more accurate 3D reconstruction?