If replacing calipers, it would be best to go with the big bore piston caliper from Wilwood or Afco if you want to increase the performance of your stock brakes.
The Wilwood 2.75” caliper actually weighs less than stock and will weigh less than the billet aluminum d154 style Wilwood caliper and should have less caliper flex.
If you want the look of the Wilwood aluminum caliper, go with the single 2.5” piston caliper over the twin piston because the single piston caliper has more piston area than the twin piston caliper.