It depends on our personal experiences with the brands.
If you've owned Yamaha and had reliability or customer service issues, then it makes sense to try your luck with another brand.
If you've owned Denon/Marantz and had reliability or customer service issues, then it makes sense to try your luck with another brand.
Same can be said of any brand.
Take-home message - it's not always Yamaha, and it's not always "AVR, AVR, AVR".