Some experience from words and hypehns in domain names
I used a hyphenated site www.octopus-energy-referral.co.uk and it is not doing too well compared to the non-hyphenated name. Similarly I have a site www.octopuscode.co.uk and it is doing really well compared to the hyphenated name because is is short and has fewer key words..
I know this is not a forensic comparison but I believe a non-hyphenated short name with fewer keywords is best if you have a choice..