Inna,
I think most responders will agree with your preference. Bass is important as are all the frequency ranges. We want them "all" to be good. Given the context of the question,I place more importance on midrange than I do the bass region. If your question is meant as a hypothetical pick or choose compromise, I'd choose good bass with great midrange rather than great bass with good midrange. I may be in the minority.
I think most responders will agree with your preference. Bass is important as are all the frequency ranges. We want them "all" to be good. Given the context of the question,I place more importance on midrange than I do the bass region. If your question is meant as a hypothetical pick or choose compromise, I'd choose good bass with great midrange rather than great bass with good midrange. I may be in the minority.