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I'll vote for the Serrurier truss, I am very happy with my build which is derived from Rolfs (Skyviking) design. Mine was built quite simply without fancy fittings, just ply rings, alum round and square tube. The critical part is to be accurate with the fabrication of al the components. Advantages are it is very light for it's size and very robust Mine does duty on an EQ6 and a DOB base. Also has the advantage of being easy to balance and it cools extremely quickly. You do have to be careful about light intrusion though. Light glow inside the UTA from nearby sources have to be watched for. My Mirror is buried down inside a lightweight black lined paper bucket lightsheild. THe whole thing is a one hand carry at about 11 kg.
I haven't noticed any sag and mines a 10" mirror. The short tube lengths make the structure very rigid.
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