Convenience is a factor. I just prefer eating Just remembered as well if you're planning on bulking up and speeding the muscle growth process I'd recommend getting some glucosamine sulphate as well for your joints.
I love fish but I'd have some concern over the mercury levels in it. Plenty on the web discusses this facet.
I dunno about mercury levels outside of tuna. Personally I eat cod since my aunt gets me loads for next to nothing. Can't be too much mercury in it, I'm not completely mad yet. I think.......
Found this in a livestrong article titled "Can I eat fish everyday and still be healthy", since I'm a newbie, it did not let me post the link but that is the name of the article. And then, they have some links in the footnotes so I will research it more but here they seem to say it is okay daily. As said, there's a lot written on this topic on the web.