The reason for space-planes is cross-range ability. Apollo had a cross-range of about 300 miles, but could only land under parachutes. Starship has a theoretical cross-range of about 300-500 miles, but in its proposed final form has to land at a specially built pad. The shuttle had a cross-range 1200 miles with ease and could land on any sufficiently long runway, though in practical terms there were only a couple it could actually use. The point of the X-37B, Dream Chaser, and similar small space planes is that they're intended to be able to land from an unpredictable orbit or change their landing zone with relative ease, not be so limited by landing infrastructure as a vertical lander, and be able to land in a more practical spot than the middle of the ocean.