ZX81 vs Atari 2600
I had a ZX81 and later got the Sinclair 16KB RAM pack...the wobbly one.
Missile Command was pretty easy to program on the ZX81, even in basic.
Back then I showed it off to a friend of mine who had the Atari 2600. Apart from the colors and sound it looked like the real thing. That was until I got the Atari600XL of course.
My main issue was that the off-the-shelf portable cassette player ( I think Panasonic) did only load the games once in a dozen times, despite me endlessly fiddling around with the volume.