Endura is a brand, not a fabric. Although it sure sounds like one.
Endura has offerings in eVent and other "fabrics" just as does Showers Pass. Endura's eVent sub-brand is Venturi and Showers Pass's eVent sub-brand is Elite. eVent is supposedly the state-of-art for breathable raingear - but many will say that eVent is still not good enough.
http://www.endura.co.uk/Search.aspx?search_text=eVent
http://showerspass.com/products.asp?...ct=Elite+2%2E0
http://showerspass.com/products.asp?...Mountain+Elite
http://showerspass.com/products.asp?...uct=eVent+Pant
My take on this is that if you're committed to buying bike-specific breathable rain gear, you might as well spend the extra $100 each for top and bottom versus Goretex. Then if you still get wet (but more importantly, cold), you can at least not blame yourself for being cheap where it
might have made a real difference.
But before I chose the full breathable route, I'd evaluate from my own perspective the cost / benefit of perhaps a non-breathable rain cape plus non-breathable bottoms. I did this and chose the eVent route, but that's because I have lately tended to tour in blizzards.
http://www.bicycleclothing.com/Rain-Capes.html
http://www.bicycleclothing.com/Water...ain-Pants.html