It may be impossible to give a simple answer, as a design is influenced by many parameters. Complexity (and thus price) might being one
A notable difference between these three games are the number of digits displayed, which goes direct into circuit complexity.
Pong has two 1.5 digit counters (0..15) (*1)
Speed Race has two 3 digit counters
General Instruments produced a chip which would form the basis of a Pong-style video game with the addition of, if memory serves, one or two transistors, some resistors and capacitors, switches, two or four controller potentiometers, a trim pot to adjust RF output frequency, and an optional light gun. A secondary chip and 3.5797545MHz crystal could be added ...