Square and Circular Carbon Fiber Tube Comparison

Hello Everyone.

Can someone summarize the pros and cons of square and circular carbon tubes? or perhaps share a resource?

I am looking to convert a plane to VTOL and plan to use square carbon tubes due to their ease of attachment to the existing wing spars.

In what case would one prefer circular over square carbon tubes?

The following are a couple of sources I have read:


Summarize it yourself:
Tubing calculator


Coool. Thanks, much appreciated!

working on a quadcopter design, albeit one that is much bigger and this calculator is a godsend. Thank you.