I prefer the GS38NXC. It seems to steam better and longer. The steam is much more concentrated. This seems to make a difference getting out hard store bought creases. The gs208 produces more steam and goes through water much faster. It also has a larger water reservoir(yet still loses). It seems for pure steaming purposes, a concentrated jet is far more effective than having a large surface area of steam. I don't want an iron. To steam hung up clothes, the gs38nxc works better. I have both steamers.
The GS38NXC can steam two new shirts (hard creases) with one reservoir. I can only do one wirh the with the GS208CTXC and sometimes run out before finished 1 shirt. I have a lot of shirts(like over 150), lol. So it makes a big difference.