[Routing] routing library comparison?

[Yang]

I'm trying to find a good routing library for my application code .

I looked at the routing section of OSM:
http://wiki.openstreetmap.org/wiki/Routing


among those listed, 4 have fairly recent developments:
GraphHopper
Navit
Open Source Routing Machine (OSRM)
Routino


what are their relative strengths? I would like to use Java, so that leaves
only graph hopper for me. but if quality/performance varies a lot, I could
try hooking up java and C++


thanks!
Yang
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