GIT and Perforce: the branching strategy?

Git actually does store deltas as well. These are called pack files. If you changed a file 100 times slightly, it is not going to keep 100 slightly different objects.

(more here: http://git-scm.com/book/en/Git-Internals-Packfiles ).

This is actually a complex topic, but there are trade-offs to how they treat branching and file history. A Git branch is at the repository level, whereas Perforce can be very granular and let you branch a single file, or several sets of files that are normally developed independently.

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