Traxxas uses there EZ start system (more convienent when working properly) flooding becomes an issue for newbies. 70 + mph is only good when going straight, yup its fast but not controlable at those speeds.

Kits are generally more expensive (because you have to buy all major components seperatley) More for experienced racers that know what they want. You can always buy a RTR and just take it apart and put it back together again.

Your body's will be limited in most onroad cars.

Upgrades will be limited on the 4tec as well.

Onroad cars Generally need big smooth spaces to get em up to speed (even small imperfections/loose material can affect performance)

See what is popular in your area / ask the locals (you will get a different opinion from pretty much everyone though)

For newbies, todays electrics can be as complicated as nitro ,especially in kit form.

I run both nitro and electric, speed and performance are about equal (You can get more out of todays electric than nitro) But I do like the challenge of keeping a nitro tuned.

Be patient, You will break things, Its not always gonna run good. Small ajustments make a big difference.

Good luck and HAVE FUN!!!