Unfortunately, we were not able to test these items, but according to the forums they are relatively similar. Here is a fairly comprehensive review by one user:

"Force feedback: This is important. Yes, the T300 has significantly more torque. The T300 has a slight springy feel that is more noticeable than any notch you can discern in the new Logitech wheel.

More importantly, the feedback, while strong, is rather 'slow' compared to the Logitech, which may be due to the implementation of the belt drive system. In contrast, the G923 is weaker, but has enough strength to still get a good feel for what is going on. In fact, the feedback is better because the gear transmits the force more directly.

It's hard to describe, but basically you feel everything more immediately and more strongly. The softness of the belt that some people like has clouded the feeling in my opinion.

Pedals: Without a doubt, the updated pedals of the G923 are better."