About Tera and GW2 armor.. I don't think you can really compare them since styles are so different.
My thief(GW2) and slayer(Tera). Both medium armor users and are around level 10-15 on the pictures.
I didn't play human with medium armor on Tera, but I assume this would be the same armor on human
I do not have heavy armor user on GW2 but I think the Tera's heavy armor was just too ridiculous. My heavy armor berserker at starter island ~lvl5-7