I was troubleshooting something the other day and I could not get FooBar to use the EMU ASIO driver which I thought was strange; I couldn't use ASIOforAll on my system either (maybe a conflict with EMU?).
This should tell you how little I have compared the two. They have added the WASAPI exclusive output recently as well. I can't live without many of the features in J. River (zones, library server, custom meta-data), but they have a very solid audio engine (32bit internal DSP) and their ASIO implementation I believe is custom as they claim that Steinberg added some unneeded complexity to it. Give it a whirl and let us know what you think.
DC