Are prospective employers skeptical of applicants who claim they quit their last job without already having a job in hand?

Last week I was separated from my company and was given an option to be terminated or to resign. I chose to resign out of principle and so that I could say that I quit my last job at future interviews, but am not sure if I made the right choice. When prospective employers are considering applicants and an applicant resigns her position without having a job in hand, do they tend to be skeptical of the applicant?

On a related note, given that I was afforded the opportunity to either be fired or to resign, is it necessarily unethical to say that I quit my job when I was really forced to choose one or the other?

usa jobs
usa jobs resume
usa hotel jobs
usajobs
usa jobs federal government
usa job in ksa
usa jobs
usa jobs login
usa jobs gov
usajobs.gov
www.usajobs.gov
usajobs.com
usajobs
usajobs.gov official