I agree with some other posts before, but want to sum up my take on it. The sopranos have the most "original" uke sound, but the fretboard in many cases does not allow to play some pieces (beyond the 12th fret). So if you like the soprano sound and want to play literature with an extended range, then soprano longnecks are for you. On the other hand, concertos almost sound like sopranos, maybe a little fuller and darker (depends on the instrument and make). I have sopranos and concerts, mostly play concerts. I had a soprano longneck (Flight TUSL) which I sold to my neighbor who really wanted to have it. Have not gotten a replacement yet, because the fretboard for that one almost felt like a tenor fretboard -- which is a size that is not for me due to small hands. (there is a Flight TUS in the house, so that can serve as an outdoor/travel uke, but without the extended fretboard).