You are aware sales for some of the 360 rpgs are incomplete right? Blue dragon for instance is clearly missing some others data. Basically all the rpgs sell .5 in others what they do in america. Yet bd is at like .2 and has no weekly data. Very likely bd is actually a good 100k higher.
Also including operation darkness is stupid. The game was so awful that people thought it was an xbla game. It had zero marketing. It was basically a throw away game.
PSU also only has american data.
So far the best selling jrpgs are LO, BD,LR,IU,VC,WKC
So basically 360,360,360,360,PS3,PS3.
Although with EU data it's likely eternal sonata would be close to VC and eventually WKC should end up at the top or at least just behind LO.
Basically niether system has shown it can really sell JRPGS. The 2 big ones for 360 have been LO and BD which managed around 880k and 700k. Both are brand new ips from a brand new studio, yes they have famous designers behind them but people pay even less attention to designers than they do to studio.
WKC is going to be the PS3's biggest rpg atm and it is from a very very well established studio. In fact right now in Japan Level 5>Square enix. Hell tgs L5s lines were by far the biggest there. I guess WKC and LO are a reasonable comparison. LO is probably going to end up with better marketing, but WKC has a far better known developer.
It doesn't look as though WKC is going to outsell LO by such a huge margin that suddenly making rpgs for the 360 becomes pointless. Basically this gen if you are making an epic rpg it should either be on the wii, or be multiplatform 360/PS3. Unless MS/Sony are willing to pay out a pretty massive chunk of money.