When I first started with on-road, I started off with the NTC3 Team Kit (Version 1). Over all the NTC3 is a very capable car. After I raced it for a full season, I found some things that fell short of what I needed. I basically outgrew the car. That's when I switched to the Serpent710.
Now that I have been racing the 710 for some time now, I found it a lot different, performance and response wise, when comparing it to the NTC3. It is just a more nimble car and adjustability seems infinite. The biggest thing that you will find more frustrating is getting it set to the way you drive.
I know the 710 you have since you got it from 710baby. He raced that thing heavily and if the settings were kept to the way he had it, it will be on point so you have an advantage. It will be responsive, especially if you have the proper servos in it to respond to your input.
Do not be afraid to use the serpent. By far, it is not a basher. Even though some would just run it in the park, it really is a performer so try to get it on a track. You will see where she shines. Leave it on an unprepared parking lot surface and you won't see too much difference when comparing it to the NTC3, except for how nimble it is. ALSO, the NTC3 RTR doesn't have a oneway in it. When you drive your 710 for the first time, take it easy with the brake. Big difference between a diff and a oneway. You basically have no brakes in the front so it will bring the rear around on you very easily if you don't dial out the brakes.
Enjoy your serpent and NTC3.