lipos are better, they give more power, no memory effect and last about 3 times as long from a charge
ESC's, do everything, from a program box, added to that the brushless motor. you no longer need to have more than one motor, one or 2 lipos/batteries. decent charger.
much cheaper than the old days, no more worries about dumping.
one motor can work on every track.
time is now spent on set up rather than power and efficiency.
pop to the club, have a chat, pick a car you like. pop along to Apex models in crowthorne and get racing.
all the guys will help. its awesome.