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TL;DR

911 (991.2) Speedster
Biggest reason is Fuel Economy (15 / 21 / 17 mpg).
911 (992.2) GT3 S/CDrivers
Biggest reasons are Body Style (convertible) and Fuel Economy (—).
Spec Porsche 911 (991.2) Speedster Porsche 911 (992.2) GT3 S/C Difference
Model Years 2019 2027
Release Date 2018-07-06
Body Style speedster convertible
Configuration Flat 6 Flat 6
Displacement 4.0L (244 ci) 4.0L (244 ci)
Engine Code 9A1 GT3 MA2.75
Crank cross-plane cross-plane
Aspiration naturally aspirated naturally aspirated
Fuel gasoline gasoline
Redline 9,000 rpm 9,000 rpm
Power 502 hp @ 8,400 rpm 503 hp @ 8,400 rpm +0.2%
Torque 347 ft·lbs @ 6,100 rpm 332 ft·lbs @ 6,100 rpm -4.3%
Compression 13.3:1 13.3:1
Bore × Stroke 102.0 × 81.5 mm 102.0 × 81.5 mm
Powertrain ICE ICE
Drivetrain RWD RWD
Transmission manual 6-speed manual 6-speed
Curb Weight 3,230 lbs 3,300 lbs +2.2%
Power-to-Weight 343 hp/ton 336 hp/ton -1.9%
0–100 km/h 4.0s 3.9s -2.5%
Top Speed 193 mph 194 mph +0.6%
MSRP $274,500 $273,000 -0.5%
Fuel Economy 15 / 21 / 17 mpg