I,ve owned all three , the AK the SKS and the Mosin-Nagant .
The SKS is a good gun but not as good as an AK because
you cannot change mags without pulling back the bolt.
So you are stuck using striper clips with the factory mag,
or using aftermarket detachable mags that you cannot
change until the gun is out of ammo or by holding the bolt
back.
Find a Polish M44 Mosin-Nagant if you can , they were built
after WW2 and are in the best shape IMO
I got mine about 12 years ago (new and unissued)and its the best looking one i have ever seen .
PS .buy a shotgun slip on pad for it, you will need it.
