(via Dani S) It depends on a lot of things! I'm thinking -- the considerations are:
complexity (ease of building/fixing)
portability (does it pack down for transport)
stability in the wind
There are LOTS of solutions for this posted at https://publiclab.org/wiki/photo-rig -- but in particular, I want to focus on very lightweight ways of doing this, since the new Mini Balloon Kit is designed for cameras <100g, and a heavy enclosure could easily double that?
I've posted this question and requested input from Public Lab community members (to get some different takes and ideas) over here:
Just an update -- Chris Fastie, a long-time Public Lab contributor, posted a great answer to this, with instructions and illustrations: