My only objection is the sound chip, C64 was WAY better for music
Yes the SID chip is better, but none of my favourite games made good use of the SID. Surprisingly, my five favourite games listed all sound better on the Atari. For example, "Rescue on Fractalus" music is way better on the Atari because for some unknown reason, they replaced the music on the C64 version. Lots of sound effects are better on the Atari versions.
There is only 1 SID tune that impressed me back in those days - the amazing "Synth_sample.sid" from a 1984 demo by Georg Feil. I'm sure there are lots of other great SID tunes, but by the time they came out I was already using Amiga which of course blows away the SID.