Define 'better sound'.

Remember that sound quality is, not only measurably, but also subjective. If I'm not mistaken, the RTi series is above the Monitor series, and should perform better, but my vote would be for the Beta 40's, one reason for that being, is I believe (correct me if I'm wrong) they were designed after Harman International hired Floyd Toole, so it should (hypothetical) be a good preforming loudspeaker.