If you are going to use Perforce. Read these articles first:
P4V review
P4V is definitely the client to prefer. The GUI manages to convey a lot more information without becoming cluttered like in P4Win.
Both the tree view and the right pane uses tabs to select view. In the tree view there is an easy to understand selection of depot or workspace view (and a dropdown for more filters). And in the right pane you can choose between file view (including a preview), history (drag and drop for diff), pending changelists, submitted changelists, branches, labels, clients(P4Win)/workspaces(P4V), users and jobs.
The file view and history view are exclusive for P4V and they make the user experience so much better than P4Win since you don't have to open dialogs all over the place!