I think the SMN relic gear is beautifull, i like the look very much.
I always wanted to have both pieces. As mentioned by others, relic body is great for macroing in during BP (because of the +3% critical hit).
I also use it for avatar of the day (obviously) for the -3 perpetuation cost. After i got it i started to use ALL of my avatars again, it´s fun and helps a ton during solo sometimes.
YY robe is good for everything else, incl. Carby, as an idle piece for the refresh etc..
From the start of my SMN career i wanted to have both. There is not much gear you´ll absolutely want as a SMN, at least not compared to some other jobs, and certainly not for the body slot.
Relic body and YY both are fantastic for our job, and if you can, you probably should try to get both.
Also, some people try to tone the usefullness of one or the other down, mainly because they don´t have one or the other, are to lazy to get them or don´t have the means to do so.
Ask yourself how much you really are into the SMN job, look at relic and YY after that and decide for yourself!
G.Gause -Mithra / Fenrir-
BST99 Guttler 29/12/2011