Hey guys, i'm old... don't flame me too bad.

I've been out of RC for about the past year. I raced 1/10th scale 4wd mod in the past.
Used to go to SoCal RC, raced a few times at OCRC.
That out of the way, I want a 1/8th truggy BAD.
Love the losi stuff, always have. Looking at the Race Roller vs the RTR.
Sorry if this has been gone over before, but I couldn't find it in the 400 pages about the 2.0 T. I'm not very good at the internets.
Are the chassis/parts/build ANY different? Obviously, for a hundred dollar difference for a spectrum radio, engine, servos, starter box, the RTR "SEEMS" like the way to go if all else is the same. Surly, there must be a difference in the build... Yes, no?
If you can please take the time, point out the differences. I was a sportsman/expert racer when I stopped, so I need/want a competitive truggy.
Race roller and build it out myself, or is the RTR everything the roller is and more? What are the differences guys.
HELP AN OLD GUY OUT HERE...
Thanks for your time.