Keep in mind that there are other things that effect leaning comfort versus sitting comfort. Foot management, tether height, and bridge length all interact and come into play.
There aren't a lot of other slings on the market. The original Anderson isn't made anymore but the Recon was introduced because there was a demand for Andersons. A used Anderson often sells for $150 (if you can find one) and it still needs modified. Recons are available in 3 sizes and are ready to use right out of the box.
I can't comment on other slings because I've not used the others but I believe that the H2 is a sling, and The Wraptor is a diy sling that is similar to a Recon, but IMO, the Wraptor lacks an important detail in its design. The upper and lower sections of the Wraptor are joined (and are "static") at the hip area, whereas the Recon sections are "active" at the hips which allows the sections to self adjust to different body shapes and different positions of sitting or leaning.
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