Sears/Husq Tuff Torq K46-BA vs T2-CDBE Transaxle; Better Tranny?

[Col F]

I just discovered that the Sears 28851 21HP/42" Hydro (Husqvarna Manufactured) lawn tractor has had multiple recent changes (past few months) from the electrical harness to the chassis, etc. Very notable is the change from the Tuff Torq K46-BA hydrostatic to the T2-CDBE-5X1A-18C1 transaxle. There is a lot of information online regarding the K46-BA tranny, but the T2-CDBE not very much.

Does anyone have information or qualified opinions on which of those transaxles is superior to the other, or more reliable / durable, etc.?

Thanks.