What Flax Seeds/Oil and Fish Oil to Get?

I’ve read many many blogs about the numerous benefits of flax seeds/old and fish oil, and I would like to get some for myself (as active male in my mid 20s), as well for my parents and grandparents.

The question is: there are so many different kinds out there, that I don’t know which ones are best, what is the difference and what I need to be looking for? Any difference? What to avoid and things like that. Suggestions of particular products and links, prices…

Also, is it better flax seeds or flax oil? Why?

P.S. Please keep in mind for myself I need the smallest possible (if pills), since I have some throat problems since child in swallowing anything, so the smaller the better! Thanks