Just as an example: In my Meta there is a lot of Killjoy. The rogue never survive an onslaught, Izamu does.
It does just depends on your meta and what you re fighting like everything in Malifaux.
If I have to be generalist I would say it depends on the master, with Kirai, Yan Lo, molly (path) and Nicodem I would take Izamu but with Mc Morning, Molly (horror), Tara, Seamus and Levi I would take the rogue.
Again this is not systematic it depends a lot about schemes, strategy, opponent, meta...etc
My 2 cents