Explanation
AMPscript conditional against the Gender field is the best method to ensure content is displayed properly within the email. It allows creating dynamic content based on the value of the Gender field in the sendable data extension. Dynamic Content Wizard is not suitable for this scenario because it requires creating content areas for each variation of content, which can be cumbersome for a customer with limited technical resources.
AMPscript lookupRows functions and A/B Test content type are not relevant for this scenario.