It mainly depends on your lifestyle, and also your wants and don't-wants and needs GS she's more then GR, but don't require as much grooming. Both, GS and GR are very smart and easily trained. If you start at a young age, the GS won't be any problem as far as walking and things go. You can find a very good trainer to train the GS, but also needs to be done at a young age. The GS requires more exercise then the GR, so if you have a busy lifestyle or don't have time to exercise/walk the GS and don't have a large yard, then you might want to reconsider. Both can be great with kids. GR are better for first time dog owners, though.
GR are genuinely for playful and friendly, whilst a GS is more protective and out going. However both are gentle, loyal and alert.
There is always the concern with those new to the GSD that they can be a little aggressive and difficult to handle. This comes from the fact that they are bred from military stock and often used in police and security roles. However, this doesn’t have to be the case with these dogs if they are trained well and placed in a loving home with good owners. A well-trained GSD can be a great watchdog, as well as a family dog, that will alert owners to the presence of intruders.
However, both can be pretty sensitive, there are issues with considerable mouthiness on both sides too, but this can be trained out from an early age.
One of the other behavioral concerns is with Golden retrievers and separation anxiety. They don’t like to be left alone too long and seek out company.
Both are very easily trained (as stated above) however the GS tends to be easier.
Some People decide to get a GR GS cross.
I personally prefer GS over GR, however I've never had a GR... No matter what though, if you're the care provider of the dog, it's your desicion. Not your family members, yours. In the end, it doesn't matter if everyone else hates GR or GS, whatever you choose, should be your choice.
As long as you find a reputable breeder, a good trainer and have the right requirements for either breed, and ability to pay vet bills ect. You'll find a life long companion, and friend, for which ever breed you choose.