Hmmm honestly they are both Very good games, I own and try to play both but thats not that easy to do,
so far I must say that Zelda has a slight edge because of its reputation and, great story there is alot of twist and turns in this one

But on the same not I was loving the heck out of my Dark Cloud 2 before zelda was released, and all B-S aside the graphics are not as pretty as zelda but they are really good , and im not as far into DC 2 as I am zelda simply because this game is kinda hard.
If you enjoyed alot of the things found in orcaina of time then darkcloud will not disappoint you in, in some aspects you can simply say sony was trying to come as close as possible to making orcarina of time 2 without catching a fat lawsuit

*LOL* anyone who has played DC 2 will know what im talking about it has alot of fun stuff you can spend literatly hours just fishing and taking pictures etc..etc.. in DC 2.
But zelda is still simply zelda a legend and another masterpiece if you ask any fan of the series.
My final breakdown is this
So far I have 44 total hours of gameplay in DC 2 and im not close to beating it because im always doing sidequest and stuff, plus the puzzles nice and hard not to mention that F**king spheda thing
And Zelda is very addicting because you strive to see whats going to happen next,but so far its pretty much on the easy side unlike previous zeldas that required a strategy guide, I have accumulated just slightly over 14 hours and so far im about 50 -65% through the game maybe more and Im not using a book, keep in mind I know I havent found everything that I should have like the heart pieces and stuff but you can still porgress because so far no boss has presented a real challage to me qand im not trying to make a spoiler for yu or anything but everyone already knows every zelda has this so, to give you a better idea of how far into the game I am I have the Mastersword and Mirror shield
I highly recommend that you get some advice from your loacl, electronics beautique represenitive, if they are anywhere as honest and have good taste like the ones in my area they wont lead you the wrong way