It depends on your rain zone. Tachyon has a link calculator on their site that will help you figure out which antennas work best with the 303X for that range.
For me, rain zone B (western US) says I’d be fine with two 303X’s with 150mm antennas. For rain zone Q, you’d want the 300mm antennas for 1200m.
Tachyon has 2.5Gbps ports vs. Wave Nano/AF60LR/Wave LR’s 1Gbps ports.
Wave Nano/LR have backup 5GHz radios, AF60LR does not.
Wave LR and AF60LR have better gain (and therefore rain resilience).
Wave Nano and LR can do 1500Mbps aggregate, whereas AF60LR can do 2000Mbps aggregate. Tachyon can do 2500Mbps aggregate.