Neither, actually. I'd prefer the first one, but wouldn't want to go back to a lid that pops instead of screws. It also seems like it would slip out of your hands easily while shaking due to not enough grip, though that may just be a wrong impression.
The second one:
- Bottom is too small = annoying to clean
- Centered-mounted spout seems less than ideal to me, I could be wrong here
- Whisker ball. Ever since the latest shaker (v4) I would never ever go back to a whisker ball. The grate works... great
In conclusion, I was hoping the next shaker would build upon v4 and add a slightly larger screw-on cap, a better fitting grate and a nicer design. All of these are minor though and I'm happy to keep using my v4.
Edit: I'm slightly confused though, how does the first one mix without a whisker ball? Does it also have a grate/mesh?