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They have widest variety. Depending on model one device can support wider variety and bigger number of devices connected, while featuring all previously mentioned capabilities and more, like GPS, multiple ways to connect to the internet (Wired WAN Mobile Connection WiFi Station mode), double sim cards for connection redundancy, they are simply much more universal than Modems and even Gateways.
“ A RUT allow allows multiple devices like phones, tablets and computers to use a single network through a wired or wireless connection.”
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*RUTX11 uses CAT 6 LTE (up to 300Mbps/50Mbps) Connection versus RUT955 uses CAT 4 LTE (150Mbps/50Mpbs).