Difference between event receivers and workflows?

1. Unlike Workflows, Event Receivers cannot be triggered manually. SharePoint event handlers run for a short period of time (generally seconds), while SharePoint workflows may run for a much longer time period (days, months, or even years).
2. Workflows run asynchronously means we can trigger the workflows only when an item is created and when an item is modified but event receivers can work either synchronously and asynchronously.
3. Workflows can start manually but Event Receivers cannot.
4. Can cancel the operation in Workflows but in SharePoint 2010 we can cancel the event receivers also.
5. We can create workflows either by using SharePoint designer or visual studio but we should create an event receivers using visual studio only.
6. SharePoint event handlers are automatically initiated, while SharePoint workflows can be initiated either automatically or manually.
7. There is no User Interface(UI) for the event receivers.