Haha, now there is a question.
With the current choice being not all that broad its easy to say "something else" defining that something takes a bit of thinking.
I would say A droid that's part Swiss army knife power tool without having arm sticking out all over the place, part bomb disposal robot and part wal-e without the stumpy arms and googly eyes.
Big difference between an all round engineering bot and a bomb disposal bot would be that the later only needs to be able to grab stuff and drop it in a really sturdy bin. The other would probably benefit from the same tools carried by modern fire fighters. Jaws of life, buzz saw. Plus whatever sort of tools future engineers would use for jury rig jobs, not sure what that should be beyond welding lasers.
To me most smaller robots look a bit slow for keeping up on the battlefield so having this being an option would also be cool: