Thanks so much everyone

We've literally just gone on what the kids liked the look of as a very first starting point, so thank you for the advice re frenchies.
I won't lie, the hair shedding is a bit of a worry as I like everywhere nicely hoovered....but it's part and parcel I suppose isn't it!! We're leaning towards a lab, as they seem to be the most reliable to train and we like they are a nice size. I would personally love a chocolate brown lab.
My friend has a beagle x, he is lovely but very sniffy as you say. He also cannot be walked off his lead at all as he would just bolt. We have heard labs are easier to train than some breeds which interested us too as we want to make sure we train a puppy the right way.
What breeds tend to molt less out of interest? We would ideally like a medium sized dog if that helps.