I like the workstations. Easier to bring one keyboard to a gig rather than a keyboard and a module. Plus, MIDI isn't as big an issue; I.E. the workstation sequencer is usually set up to work most effectively with its keyboard as far as midi channels corresponding with separate tracks and such. Using a sequencer and controller means getting all the parameters on each unit matched to each other. Plus you're dealing with midi cables, not a huge deal, but simplification is good if you ask me.

Other people like software sequencers and a good controller, so as to have a computer screen and easier maneuvourability with the sequencer. I guess it depends on whether you're gigging or just playing at home. I like the workstations either way.