Are the more expensive vitamins really higher quality than generic? How can I tell the quality of vitamins I purchase?

After my last blood work up my doc said I have some vitamin deficiencies. I bought some very cheap daily multivitamins at a dollar store. I have seen some more expensive vitamins online that swear their product is superior, more easily absorbed, better ingredients, etc. Is there any truth to this, or would I just be paying more money for the same thing?