Remote Drones are best used in the role of things that don't have to worry about jamming- VTOLs, Aerospace, etc - because ECM is quite deadly for them. Robotic units, meanwhile, are good for pretty much anything; though I recommend you employ the older/prototype rules where you define their If-then decision trees yourself; because one, the vanilla ones are both hard to use and frequently less than optimal (and, of course, make everything behave exactly the same way, which is not always desirable), and two, it's more fluffy that way.
Casper level stuff is a whole different kettle of fish, of course, those are good wherever since they just operate like normal units with a few add-on rules during play.