Both Robert Frost and Wallace Stevens were early to mid-twentieth century American poets who lived in New England.
The first difference between the two were their career paths. Wallace Stevens worked for Hartford Accident and Indemnity Company, where he evtually attained the rank of Vice President. He turned down a major professorship at Harvard and continued to work well past his retirement age at his executive position. Although he was a dedicated poet, he was an equally dedicated corporate employee. Robert Frost, on the other hand, had only temporary jobs other than poetry and dedicated himself to a full-time writing career.
The seond major difference is that Wallace Stevens embraced literary modernism while Robert Frost rejected it.