I've had mainly Giant Schnauzers before getting Zephyr, and I have to say Zephyr is much easier. He is so much less destructive in the house. I am still finding and undoing things that "Schnauzer-proofed" my house! I lived for 13 years with mouse traps on my sofa to keep Zorro off of it. I wouldn't have cared if he went on the sofa to sleep, but he would be like a little kid jumping on the bed and the cushions would be scattered all over the house. If the mouse traps were there (he popped one once when he was a puppy and after that they were unset for the rest of his life) he would stay off, but if I took them off he would immediately be up there having a ball.
I had to put a hook on a back bedroom where I keep my saddle because he would open the door, pull the saddle off of the rack and drag it all over the house. He never chewed on it, just dragged it around. Many other things around the house to try to keep them out of trouble.
Grooming is actually easier with the Poodle, because I can do him in pieces, and I can keep him looking really nice between groomings with the scissors. I can do face one day, feet another, body another. With Schnauzers you have to wait until they look hairy and unkempt and then do the entire dog; plus the head is (I think) harder to do. It took me a long time to learn to get the eyebrows right. Plus ears seem to be much harder, they get clipped with a 10 blade inside and out and all around the edges, and dogs universally hate it--and Giant Schnauzers are much more powerful physically and mentally when they fight something.
Giant Schnauzers must get lots of strenuous exercise every day. They have to run and run and run and run and run. Otherwise your house will suffer. They also need lots of mental exercise every day, otherwise your house will suffer. Zephyr has plenty of energy when there is something to do, otherwise he is chilled out and doesn't mind sleeping all day.
One big difference is just having a dog that people are not afraid of. With my Schnauzers I had to be careful all the time. People were afraid of them, which could make them aggressive. Schnauzers are bred to protect and defend and they take that job very seriously, so you have to be very careful that they don't see something as a threat and react to it. I miss having my guard dogs, but you have to understand that having a guard dog means you have to guard them as much as they are guarding you. You have to make sure that they don't react to things inappropriately, and this is not easy. You have to be alert all the time. They are always looking for threats, and it just takes a millisecond for the dog to change from a relaxed, happy dog into a guard dog and go for somebody. That is why I have a poodle now, I just couldn't do that anymore.
One thing that is harder with Zephyr is trying to find ways to motivate him in training. He is not interested in food. He will sometimes take treats, but will not work for them. He will play with tug toys for a little while but then gets bored with that. The thing that is best with him is petting and praise, and physical play, like shoving him around, but if he's not interested in what we're doing it's very hard to get him to focus.