Concert is the most versatile ukulele size. For kids, they can grow into it easily. For adults with big hands, they can learn to play with a comfortable sized uke. For those wanting to pump out some solid volume, the concert does that also.
Most concert ukuleles come in the classic "figure 8" ukulele shape. There is very little reason to be looking for a funky instrument in a concert size, these are usually reserved for soprano size. For a top quality lifetime instrument which you can take anywhere, stick with a classic shaped concert ukulele.