of course, the higher the efficiency the better for energy production, but the difference between an 18 and a 20%, say, efficiency module is likely more than compensated for by the difference generated by smart reorientation during the day, if not otherwise planned for. I'd focus more on that before worrying about one percent efficiency increase.
I think there is a lot of misconception about the concept of efficiency for solar modules too. It is really directly related to size. If size is not a critical issue, than a slightly bigger module at lower efficiency can give the same amount of energy at lower cost.
And there is the issue of space utilization. In the pic up top, the cells could have high intrinsic efficiency (although I don't believe the 23.8% claim), but the poor use of space (lots of space between cells) will lower significantly the overall efficiency of the module.
And don't believe all you see advertised as "flexible" panels. Outside of organic cells (not available off the shelf and very low efficiency) and some thin film types, the fabric backing may be flexible but most often the cells are really not. And if they are very thin, which goes with the "light" marketing, and silicon, they are particularly fragile. I've played with some that you looked at wrong and they would shatter...

I'd want them well protected while being transported which would about nullify the light and handy concept altogether. Just throw them in the back of a bouncy offroad truck and you may have a bad surprise at your destination.
Sorry...