FL is good for writing more loop type projects (not saying WITH loops, but with the tools they give you) it's known to be good for workflow, but there still is some shortcoming in the overall mixing/mastering plugins that it comes with.
Logic has some workflow flaws, but they aren't terrible. It pretty much wins in terms of what plugins and effects it comes with. It's kind of handy in the way you can freeze tracks, and how the VIs are delt with CPU wise.
It's also 64 bit, when it needs to be. EXS24 can load past the mem limit, and with snow leopard you can load more with other plugins if they are 32/64 compatible.