Not enough to make a difference regarding the op.
So i guess i googled 26x11.5 slick huh? Well your wrong there again. I spent a good 10-15 minutes on summitracing searching through the 15” tire options with the parameters the op was looking for and posted the results. He was looking for which brand, i listed his options to clerify which brands he should look for and then maybe someone else would of chimmed in with experience on one of the brands listed.
You accuse me of google searching a 26x11.5 slick yet you looked on a caculator and backwards calculated a u.s. size into a metric size that doesnt exist. The industry standard used to be u.s. before metric sizes came along. There is no benefit of posting the metric sizes you listed as there is no beneficial information there.