Slot racing systems and Scalextric and Carrera sets have just kept improving! Generally new cars are such good quality and nicely detailed they are worth buying as static models. Standard analogue or digital is the question? Digital is great for larger layouts while the standard sets still give great racing and can be upgraded to digital later.
Many different makes of car will run on Scalextric track, including Carrera and Revell, but ensure the control set up is correct.