Considering data link, 2.4mhz or 900mhz data link

Reading the FAQ on the data links,

"Does it interfere each other if my Tx and datalink are both 2.4G?No. It uses intelligent frequency hopping technology, they won’t interfere each other."

So whats the main difference between the 2 versions of the data link? Why is 900mhz twice as expensive as the other? Is it just longer range?
 

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