Which of these profiles do like best for a standie?

I've recently acquired a trailer and am going to build a light standie similar to the original puffin.
I have been thinking about 2 different designs and would like some input.
which of the following do you like the best? I'm thinking that the squared off one would be easier to build but I'm not sure.
Also, do you think that a rounded trailer would be more structurally sound?
or

I have been thinking about 2 different designs and would like some input.
which of the following do you like the best? I'm thinking that the squared off one would be easier to build but I'm not sure.
Also, do you think that a rounded trailer would be more structurally sound?
or