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Ok, there is a big difference between guide dogs (for the blind - very specific) and service dogs.
Standard poodles may not do the selective disobedience thing reliably as a breed (though there are individuals that do) but for most types of service dogs you really don't want that.
Speaking as someone in the *know* I can tell you it's the coat. If they didn't need clipped down every 6 weeks they would likely be the most common service (mot guide, but service) dog around. There is nothing that a dog can be trained to do that you can't train a Standard poodle to do. I even used to groom one that worked cattle better then the owner's other dogs (ACDs).
They make awesome household assistance dogs. So if you can be sure that every 6 weeks for the dog's life you can have it clipped and you like a poodle/have allergy issues, then Standards are great.
Whichever breed you pick, be sure to get it from lines that are good, working lines. A downside of Labs being so popular is it can be hard to find those that aren't "scatter bred" A grandparent was a Field Champion, another was a show Champ, this one was just a nice pet, this one some other sport was done with. Well, are you going to get the hyper personality of a field dog, the more dominant/independent personality that catches the show judge's eyes, what? It's not like mixing paint where red and white make pink, it's more like rolling dice, some traits will pop up
You want one that has the same thing over and over in the pedigree. OTCH, OTCH, OTCH, OTCH - then you know this line has been bred to be biddable.
Since Standards are more rare, they have fewer lines so less variance across the breed. Although I'd stay away from the "colored" ones like Parti and Phantom as there are plenty of those who have been bred solely for color (always a bad idea, regardless of breed or species) There are one or two show lines that don't have a great temperament and can be snappish, but anything with CGC and OTCH in the pedigree won't be that bloodline.
Good Luck!