The Z80 and its implementation in the ZX Spectrum 48k will always have a place in my heart. So many BASIC games typed out, so many magazine tapes loading strange programs and games.
And the M68K powered my Atari ST, my friends Amigas, and so much more.
Makes me wish I could get a small ZX Spectrum, Atari ST, and Amiga hardware kit that would interface with USB HID stuff and output displayport/hdmi. (rather than software emulation on a Raspberry Pi)