It all depends what you want to do with the car & how to set it up for yourself, you may want a nice fast steering responce so need a fast servo, or if you are just bashing a semi-decent basic one may do the trick. Likewise with the speed control, it depends on how you want to do things, do you want something that will run a basic motor for now, but have the option to upgrade motor later, or do you want to go with something you can just set & forget, or something you can tinker around with to get better performance.
In my car, i have recently updated my ESC to a Nosram ISTC as i've fitted the Ansmann 6.5 Xirius pro motor & i have a Futaba S9451 SERVO in there, although if i was going to replace it i would probably look at a Savox SC1251 as it's low profile so can pack some lead weight at the back of it.
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