I go with the speccy myself, pure nostalgia reasons, Ive got a long harboured z80 processor fetish. Although without a doubt their were many games that looked better on the c64...
My family owned Mr Sinclairs specials since the zx81, all the way through to the ql, and we eventually moved up to the Tatung Einstein another z80 powered computer

My second portable computer was his Z88 notepad z80 powered again... amazing device for its day I wrote a windows type operating system and many games for that thing...
Scarily I think we must have had 12 or 13 different computers \ games consoles with the "same" processor over many years

I have to say out of the classic elites I grew up with the tatung einstein one which was basically like the spectrum version, Ive long felt the interface looked cleaner and less garish than other classic versions
Sadly enough my MP3 player also sports the good old z80 processor

a fraction of the price of the apple players...
This reminds me Ive been meaning to dig ot a spectrum emulator to kick back with a little bit of "paperboy"...