Any healthy dog can be a great companion and most behavioral stuff is on us, not the dogs. We have had quite a variety and tend to shy away from highly bred dogs, preferring a healthy rescue instead.
Here are our current companions.
Achilles (L) is a 12 yr old field spaniel rescue. He was a handful when we got him with a lot of anxiety but daily training and walks have resulted in a nearly perfect dog for our household. 50lbs, very bright, very cooperative, and loves everybody except the mailman and UPS. He responds immediately to about 30 commands and is boundary trained.
Fiona (R) is about 4 mos old in this pic and is a Doodle $$$. Wife wanted her so here we are. She will grow to around 60lbs and does not shed but requires regular trimming. Wifey decided to handle this rather than monthly grooming and it is pretty easy. So far training has been very easy as she is bright, calm, and cooperative. Sit, stay, come, down, wait, leave it, in, out, are all part of her vocabulary now. I expect this to be a very healthy and well behaved dog.
We had a bunch of hounds and I liked them but they follow their nose too much and need confinement. Boundary training was only about 50% effective as a result. If I didn't have these two I would consider a heeler or Aus Shepherd because I like a dog that is bright and eager to please.