I think the Pro is far better imo, below are comparison:

Pro:
1. CNC front and rear towers.
2. CNC 7075 main chassis plate.
3. CNC front knuckle,
4. CNC front and rear brace.
5. All around CVD shafts.
6. Carbon fiber servo plate and center diff plate.
7. center spider diff.
8. CNC front and rear arm holders.
9. CNC steering plate.
10. Aluminum wing support.

RTR:
1. Plastic Front and rear shock towers.
2. Stamped 6061 main chassis.
3. Cast aluminum front knuckle.
4. Cast aluminum front and rear brace (can break easily)
5. only front CVD shcfts.
6. Aluminum servo plate and plastic center diff plate.
7. standard diff.
8. Plastic front and rear arm holders
9. Stamped steering plate.
10. Plastic wing suport.

Did I miss anything?