... (I owned a C=64, worked on a TRS-80 Model III in High School), I have to say that the C=64 blows doors off the TRS-80 Model III. Sorry, but the music chip, color graphics, and all the other misc hacks that were produced for it (ICEPIC, scanning audio files through the tape drive, etc) were fantastic.
I do, however, have a place in my heart for the Model III,. My High School computer lab partner and I wrote a Monopoly game for it, complete with kiosk "graphics" (wrote out "Monopoly" in cursive, plus some other rudimentary graphics), choice of number of players, play the computer, and, of course, a cheat mode where you were presented with a menu of "1) Steal money from bank 2) Steal money from opponent 3) Move houses from your opponent onto your properties 4) Destruct game - (basically swiping the board off the table in a 3am drunken stupor when you're not winning)" and a few others I believe. We displayed 7 spaces at a time - 3 ahead of you and 3 behind, and indicators if you had houses, who owned it, etc. I learned quite a bit about programming from that project!