Generally, for a daily driver, vacuum is the recommendation.
Mechanical is recommended for controlling the precise opening time of
the secondaries (exiting a corner in road racing or wheel spin control
in drag racing). If you pick too big of a carb, with mechanicals you
probably won't be happy with the performance, plus mileage will
suffer, but vacuum can be adjusted to still perform reasonably well.
IMO
Use the $100 difference to get another vacuum secondary housing and a
tuning kit, with just three screws and a c-clip you change the opening
rate for the seasons.
Rich