I've never really liked the 6502, it's like an 8 bit CPU going out of it's way to limit everything to 8 bits.
For a simple accumulator CPU the 6800 more closely matched my model of an elegant 8bit CPU.

But for sheer usefulness I've thought the Z80 managed to squeeze the most out of a 40pin package.

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I love the 6502. Cleary it has limitations, but in many respects it is a magnificent chip. The Z80 is quite different, and also grand in its way. There are many things that are easier to do on one than the other, but given the choice I tend to go with the 6502. If only they'd put the extra 65C02 features in from the start...

Ken