Hey! First off, I can't recommend enough this series 4 beast. I was a Series 0 SS owner, and loved the idea of the apple watch, but the struggle of the first gen was real. Coming into the S4 SSG, is like the biggest and most surprising Apple upgrade I've done in a long time.
That said......I'm a 6'4" male and have always had the 42mm casing, which was perfect. Despite my height, I've always had sleight hands and wrists. Anyway, the new 44mm casing doesn't feel any larger in practice, but the new screen real estate is a HUGE visual impact over the 42mm casing, almost leading me to even consider the 40mm casing, as that has nearly the same screen size of the old 42mm......phew so confusing.....anyway, my point for your consideration is to also think about the size of the screen display area. Either way you go though, you're going to love this new watch.