At the beginning of the 10m challenge, I immediately had the idea of building a SOTA-compatible antenna exclusively for the 10m band.
I chose the J antenna, which I could easily build from RG -174. It was small and light when packed.
I found the graphic at DL3TU
The SWR values on the NANO VNA looked great… and then I compared them with my endfed for 40/20/15/10m at the summit and was extremely disappointed! It was significantly worse!
Colleagues told me that RG 58 would have been the better choice… but that would have been too bulky for me.
I then turned to the topic of oblong. But that is usually too bulky for me on the way to the summits, especially because I often do several summits a day… so I mostly continue to use my endfed… 
73 Armin