I agree. There are (i) good and bad capacitive screens (ii) good and bad resistive screens (ii) good and bad UI programming.

Personally I much prefer the very good N900 resistive screen to the very good iPhone-4 capacitive screen.

However, one thing that does separate them is the support for multi-touch UI. Although not critical for all applications today, there are some that need it, or at least are much better for having it. Also, I suspect that multi-touch will become more important in future applications.