Is it simpler to get 2 single entry visas or 1 multi-entry visa for Thailand?

The user wants to know whether it's easier to obtain two single-entry visas or one multi-entry visa for multiple stays in Bangkok. They mention spending three days in Bangkok, traveling elsewhere, and returning after a month for a three-week stay. Some comments suggest that a visa may not be necessary at all if they're eligible for visa-exempt entries.