MOUSE CLICKS OR KEYSTROKES------which you like???

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this is smthing which everybody deal with and i think most prefer mouse clicks as its just so easy to click ..... but still hav seen many use keys instead of mouse some places although mouse present.....like for example for COPY- CTRL C,,PASTE-CTRLV etc,SCROLLING-UP/DOWN KEYS....so i just want to know which one you prefer MOUSE CLICKS OR KEYSTROKES???????