iRacing:
The entire software suite is iRacing in-house so no 3rd party modules to cause issues.
Every car is a race car and for the most part current race car or prior generation so for instance if someone wants to drive a mustang it will not be a street version it will be a Mustang GT4 or GT3 that you would see racing on TV
Not many cars can use a H-Pattern shifter. A few like NASCAR Truck, an older 2010 version of the miata, small track oval cars, and a handful others. Most current race cars are paddle, any car on iRacing can be automatic, paddle, or sequential.
Driving physics and view are more lifelike for a more natural feel.
Anything from global cup miata, NASCAR, Prototypes, F1, IndyCar, GT4 and GT3 sportscar, Small track asphault oval, dirt like sprint, Trophy Trucks, and national tracks worldwide.
PROS:
All software in-house and stable
Physics and Feel
Smart Ai computer opponent drivers
Can Run Solo, with Ai, Linked Up with other sim pods at location, or linked up with additional Ai.
Optional leaderboard screens and spectator camera screens control.
CONS:
Not many cars can use H-Pattern Shifter
Non opensource software so the cars and tracks they have is what you get and currently only national tracks and race cars.
No street versions of cars
Cannot connect to online racing currently
Even though the commercial version comes with every car and track in their database a few tracks or cars may not be allowed to be used in a commercial setting like SpA or Silverstone.
Mandatory Long Updates Throughout The Year each quarter