Tropylium is highly stable due to conjugated system, that being resonance stabilized and the number of canonical forms of tropylium is more. But it is less stable than tricyclopropylmethyl carbocation because tricyclopropylmethyl carbocation undergoes a strong stability mechanism factor that is sigma resonance or dancing resonance (sigma-tropic rearrangement ).
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Cf3 will be more stable
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First one tropyliym is more stable than tricyclopropyl Carbo cation
Tropylium is highly stable due to conjugated system, that being resonance stabilized and the number of canonical forms of tropylium is more. But it is less stable than tricyclopropylmethyl carbocation because tricyclopropylmethyl carbocation undergoes a strong stability mechanism factor that is sigma resonance or dancing resonance (sigma-tropic rearrangement ).