Welcome to Backyard chickens. In US we have bantam sized Silkies. I think in other countries they are larger birds. Care for silkies is pretty much the same as other breeds BUT,
with their big crests and beards their vision is obscured. This makes them easy targets for predators. Also silkies don't fly but, they can jump pretty high. Still can't escape from preds. Other breeds tend to peck & bully them because they don't look like regular chickens - same thing applies to Polish breed.
If they grow up with other breeds I think that is not as much a problem. I don't think they can handle extremes in temps. like heat. Silkies are not the best layers BUT, they are considered one of the best broodies. Hatchery birds generally have that bred out of them because going broody means they will stop laying for a few weeks. Breeder stock carries the broody traits.
White silkies stand out to predators (except in snow) so I would imagine the partridge and darker colors have some camouflage benefits. You may want to explore the several dedicated silkie threads, mainly divided by color: Buff silkies, Nothing but Partridge silkies, ,Paint silkies and my favorite simply "Silkie thread. You can find any by putting the name in the search box and it will pop up.
There is also another variety of silkie called "Showgirls," they come in silkies colors, same type feathers, also tend to be very broody and docile. They are more exotic looking- people either love or hate them. They have totally naked necks or the bow tie type has a puff of feather midway down the throat - which I think is cuter.
PS if you don't show them you can cut back the beards and crests so they can see much better - though they still don't have the defenses to escape predators.
