I went through this last year, and eventually bought the 90W folding panel from Overlandsolar.com. The decision for me came down to storage size when traveling. The Overland panels fold into thirds and had a nice case for storage, which worked well in our situation. Our AS and truck mounted camper both have roof mounted solar panels, and have external Anderson connectors wired to the camper and AS mounted solar controller. The portable panel is an addition for when park in the shade, or need extra power, etc.
I liked the Overland set up because they wire it so you can easily bypass the panel mounted controller, and run directly from the panels to your trailer (if it has its own controller), to minimize voltage drop. But I would not purchase their 30' extension again, since it is made of 10 ga CCA (copper clad aluminum) speaker wire, not stranded copper. I made my own 30' extension with 8 ga marine duplex, and cut the 10ga CCA extension into shorter lengths for other projects.
Based on my research, there were many people that were happy with the Renogy 100w panel and it appears to be a good value. It was a very close second choice, and likely would have worked just as well as the Overland panels.