Ooooh, I just gotta say something.
The C64 was equipped with BASIC, as were the others, but the 64 had more colors and big sprites to play with, not to mention sound. Not really easy, but more to show for your work. The C128 on the other hand is oft forgot but was a real whiz-bang. BASIC 7.0 gave easy control of the sprites and sound, enabling you to make the computer dance and sing to your desires with only modest work. I bought an Amiga because Ben ?? the editor of Info mag. said I should, but I have never come even close to getting the functionality out of it that the C128 provided. Visual Basic for Windows comes close but is still way more difficult. Of course, my wish to write simple programs for my work is just me, "your mileage may vary."
I have a room in my house (the museum of obsolete technology) with C64s, a C128, a Mac, a hopped up A500, an old Wintell machine, and a speeded up A4000. If the comet hit tomorrow, and I could save only one thing for posterity, I think it would be the C128.
2 cents worth-
CRL
