Choosing a directional antenna for a point-to-point setup is ideal because it focuses the signal between two specific points, which enhances the signal strength and reduces interference compared to an omnidirectional antenna which spreads the signal in all directions. Omnidirectional antennas, despite their usability in different scenarios, are not optimal for long, specific links as they do not focus the signal. High-gain antennas without specifying directional or omnidirectional criteria might seem suitable, but the key is the directionality which maximizes the strength and focus of the signal. Finally, an autonomous access point is a solution for network management and flexibility but does not inherently address the directional strength needed in a point-to-point connection.