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smaller size of B-atom as compared to that of C-atom

stronger $\sigma$ bond between $\mathrm{B}$ and $\mathrm{F}$ in ${\mathrm{BF}}_3$ as compared to that between $\mathrm{C}$ and $\mathrm{F}$ in ${\mathrm{CF}}_4$

significant $\mathrm{p}\pi -\mathrm{p}\pi$ interaction between $\mathrm{B}$ and $\mathrm{F}$ in ${\mathrm{BF}}_3$ whereas there is no possibility of such interaction between $\mathrm{C}$ and $\mathrm{F}$ in ${\mathrm{CF}}_4$.

lower degree of $\mathrm{p}\pi -\mathrm{p}\pi$ interaction between $\mathrm{B}$ and $\mathrm{F}$ in ${\mathrm{BF}}_3$ than that between $\mathrm{C}$ and $\mathrm{F}$ in ${\mathrm{CF}}_4$.