I find the Specialist works best for me with IWB holsters. I'm ordering a Supreme now for AIWB use to replace my worn Voland Atlas G-hook Slim.
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The Supreme belts are designed with AIWB in mind but they will also work for IWB. The Supreme belts do not have any scuba webbing so they offer more flexibility which is excellent for AIWB but works very well for most any concealed carry set up. Of course a lot comes down to personal preference but typically an overly stiff belt is not ideal for both AIWB and IWB.
I've been able to utilize my Specialist belts for OWB carry, but it is stiffer than the Supreme belt.
These really do strike the right balance of support and flexibility for AIWB carry.
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Thanks everyone for the very helpful replies. While I’ve tried AIWB, I actually prefer strong side carry, which is why I asked. So I now have a Specialist on order for IWB strong side (actually my 2nd one). If my preferred carry ever switches to AIWB, then I’ll definitely consider the Supreme. It looks like it would work perfectly for that style of carry.