That's not an answerable question, because they're different techniques for different genres. You won't get a future 2.5D game using technology like Crysis, or a future Crusys game using the illumination tech of LBP. All we can do is appreciate technical achievements. Comparing them is futile. It's like 'which is better, a tractor or an F1 car?' They're different vehicles for different jobs, even though fundamentally they're the same. The technical achievements of each are very different to satisfy different roles. Either 'better' has to be reduced to individual aspects (which has the best draw distance? The most triangles per second? The most shader instructions per second?) or accepted as 'which do you like the most?' which is mostly a personal aesthetic.Ok, how about a different approach, on a purely technical basis, putting aesthetics aside, which game is achieving the most from a technical perspective?
Or put a different way, from a code/features point of view, taking artwork completely out of the equation, which current or upcoming game is most like the average game we expect to see in 5 years?
The only time technical aspects can be compared is between games with the same requirements. Given the same scope, environmentals, characters, particle requirements, etc. which FPS has the best engine? That's a valid question.