I do all my thinking and planning on good old pencil and paper.
But when comes to getting speedy job done, I would use computer. I do type faster AND undeniably, computer is tidier...

I don't normally use handwriting for the MAIN content. nowdays. I did that when I was in school, and write down in cheap exercise book.
Now with conmputer, I think it is more efficient and fast.

Every sentence I write in my summary during planning, could convert up to 10k words when writing the main story. Computer sure help a lot... save more energy.