Each breed you have mentioned has different traits and characteristics, for eg. a GSD is a good gaurd dog or we can say its a all rounder in all areas, lab. is a retriver and was breed to retrive things for fishermens, not a gaurd dog but it will provide an alarm and welcome all vistors with happy tail, Daschund was used to chace rabbits from burrow.
I would suggest first make ur mind, what would be ur purpose for getting a dog ? once that's clear choose a breed which exibits that traits, hope this would help.