Phenol is more acidic because of the benzene ring present in the molecule
Actual bonding within the aromatic ring can best be considered as represented by the usual canonical resonance structures, essentially the C to C bonding is SP2 hybridised. The bonds between SP2 hybridised carbons tend to exhibit an inductive effect to a greater degree than SP3 bonds which are found in saturated structures like methanol or TBA, and this allows the an oxygen anion from the -OH group in phenol to be more readily stabilised, and more easily formed. As a result, the -OH group more readily loses it's proton, and phenol is therefore more acidic than the saturated aliphatic alcohols.