I have created few domains with good keywords recently and tested this thing. Its true that Domain with hyphen is having less importance in google than domain without hyphen. To get the domain names, I use hyphens in between keywords and they rank less in google than others without hyphen. What is your thought on this ?
Short domain names are good and domains with hyphens are best. You can choose any name of domain. The only thing is that you should concentrate on Onpage and Offpage SEO for better results
We'll my thought is to used domain without hypens as they are more user friendly and visitors can easily remember it.
I think is easier for people to remember domains without hyphens, but you can use the hyphen if you want.