I am not currently trading AMEX stocks. How I would rout orders would depend on my trading strategy. I think the AMEX specialist operates like the NYSE specialist, so I would probably use AMEX routing. Using SMART routing with listed stocks will sometimes get a better price or faster fill, but it makes us dependent on IB's order routing logic and other uncertainties. I also don't know if IB shows quotes from regional exchanges for listed stocks, and whether IB can rout orders there.