I was caught between sizes on that board too, and I thought the the 138 was very different than the 144 for me.
I'm 5-9 170. The 138 snapped hard. It was fast and smooth. But coming from a 142 Transcend, I didn't adapt well to the landings on the 138. I bumped up to the 144 and just couldn't ride it. Messed with my timing....I couldn't make it pop for me.