Web Development Directory structure

We have started the new web development and I was discussing about the directory structures with the leads. Initially we had created the directory structure based on technology. I would like to call that as "Technology based directory structure". Recently while we were reviewing one of the open source product, we found that there directory structure is based on "Requirements/Features". Combining the above two we came out with Requirements-->Technology directory structure.

Examples:
Technology based directory structure:
Service
|___ api
|___ impl
|___ dao

Feature driven Directory structure:
Service
|___ usermanagement
| |_ api
| |_ impl
| |_ dao
|___ groupmanagement
|_ api
|_ impl
|_ dao