Star Ocean: The Last Hope International - Tweaked graphics, option of Japanese voiceovers, selesctable character portraits.
Eternal Sonata: Re-worked better ending, two additional playable characters, bonus locations.
Ninja Gaiden Sigma: Higher resolution and framerate, extra playable character.
Darksiders: Better framerate, less screen tearing.
L.A. Noire: Better draw distance, runs smoother.
Blaz Blue: D-pad better for fighting games.
Dead Space: Limited Editition, comes with Extraction, looks better.
Dante's Inferno: Better looking, extra content.
Dynasty Warriors 7: Less pop-in, better framerate.
Dragon Age: Better visuals.
Enchanted Arms: Extra character.
Borderlands: Looks better overall.
And these are just a few examples. My whole point is that saying multi-platform games last gen being better on the Xbox 360 is not as clear cut as some would hope. It was more true in the beginning, but it's now more stigma.
A lot of the stigma came from the fact quite a few popular games were bad ports on the PS3. Bestheda games, Orange Box, Bayonetta and more. The difference between xbox one and ps4 multiplats is resolution pretty much which requires a lot of analyzing to even tell the difference. Bad ports on the other hand are very easy to tell on the ps3.
OT: Investing in third party deals is stupid in the long run unless you're buying a third party developer/publisher out. Yes its great for this generation to make some money, but in the long run it doesn't do anything for you. Every new console starts back at 0 in the begining of the generation and big AAA QUALITY exclusives is what helps you push units. You have to build that up or you're going to run into a brick wall yet again. Don't ignore third party games obviously (Nintendo), but big AAA exclusives make people want to buy your console.