Is strong competition between stocks good for business and for investors? (NVDA and AMD)

$NVIDIA (NVDA.US)$ $Advanced Micro Devices (AMD.US)$ I noticed both NVDA and AMD are doing quite well lately, despite both being in the same sector. I've been invested in both of them for quite some time, foreseeing a future where they both butt heads and compete while also pushing each other to work harder and advance faster.

Anyone have similar outlooks? So far it seems like it is and will come to fruition. Is there room for both of them to continue to grow? Do you think such growth and accomplishments is related to competition, or it's just a coincidence? Do you have more eggs in one competitors' basket than the others?

Personally I still like NVDA more, but I can definitely see them both excelling in different areas of the same industry.