I'd personally would go for either a Vermeer or Ditch Witch.
Granted, it's all about applications, but there is no way I would want a sit on machine for the work I generally do. The ability to be able to get on and off the machine to help load the bucket, or just an extra set of hands is priceless to me.
So, I can get off the machine, help the employees/helpers, and get back on. So not only am I eliminating labor on jobs with what the machine can handle, but I'm also not loosing labor by having someone sit in the cab with their thumb up their butt while the workers are doing hand work around the machine.
As for safety, tipping any machine is operator error. Either a cab or platform, there will always be the risk of getting hurt involved.