I've never used either one on wet hair so I can't really compare the two in that way. I find with my hair I need to dry it thoroughly before I flat iron it to get best results. When I'm rushed and I dry it most of the way but not completely, then try to flat iron, it it doesn't come out as good as when I dry it all the way with the hair dryer first. I might just try it tomorrow on wet hair just to see though.
If the weather isn't too humid, my hair will stay flat the next day although I will wash every day even if it still looks good ~ I feel like it gets too sweaty when I work out in the AM