We race indoor carpet offroad... and our expierence is this..the T4 handles MUCH better. However...the front end is like glass..meaning it breaks much easier then the T3. Axle Carriers and C-hubs. We use wood boards for the layout, wich I realize are NOT very forgiving...but the T3 seems to take more abuse.
I have a T4, and I wouldn't look back, but as far as durability...T3 I think is stronger.
The products and places I support.
www.michianarc.com www.facebook.com/michianarc - www.russellrc.com
www.teamtekin.com - www.teamcrc.com - www.teamassociated.com
www.fantomracing.com - www.discountrcstore.com