$40USD PS3 / $40USD Vita
Are the games separate?
PS3 version comes with both games on one disc.
Vita version for US/Europe comes with a cart for X and a download code for X-2. The PSN version has both games bundled, separate downloads/bubbles though.
Vita versions of X and X-2 for Japan/Asia are sold separately. R3 is English dub and sub.
This game is not cross buy and Square Enix has stated there will not be an option to buy them separately.
What is the resolution?
PS3 version is 1080p (not sure if native). Vita version is sub-native. Both 30fps. Both look great.
What is the download size?
PS3 is 22.9GB, Vita is 3.4GB for X and 3.4GB for X-2. These sizes are slightly different for Europe.
Does the game support cross save?
Yes via syncing to the cloud. The cross save may work cross region, it worked for me but not for another person.
How do trophies work?
X and X-2 each have their own set of trophies and a Platinum trophy each. Trophies are shared between the PS3 and Vita versions and between regions, so you can only get one Platinum maximum per game.
Does it support DualShock 4 on PS3?
Yes it does.
Should I buy the PS3 or Vita version?
The PS3 version has crisper, higher resolution graphics and a slightly more stable framerate. The Vita version is portable and has suspend - which helps for things like lightning dodging - and still looks great. They both have the same content. When in doubt...
Standard or Expert Sphere Grid?
This is up to you. First-time players will probably want to play the standard grid as it's straight-forward and easier, but is mostly linear until late in the game. The expert sphere grid allows you to build characters how you like but can be confusing if you don't know what you're doing. The expert sphere grid also has less nodes overall, but this doesn't really affect stat maxing. For trophy hunters, the expert grid will save you an hour or two. The standard sphere grid in the international version is actually slightly different from the U.S. version but it's not really noticeable.
What additional content is there?
Final Fantasy X is the international edition adds the aforementioned expert sphere grid. It also adds the Dark Aeons and Penance, optional bosses who are far tougher than any of the regular bosses in the game and add a significant challenge. There are some other small balance changes and bug fixes. For Europeans, this is the original version we got, so there's nothing new (except 60Hz!).
Final Fantasy X-2's international + last mission edition adds two dresspheres, new garment grids and the ability to capture monsters / recruit NPCs and have them join your team. This includes familiar faces from FFX. Last Mission is a rougelike game set after X-2's main story which has you scaling the Iutycyr Tower. This version has never been available in the U.S. or Europe.
Will my original US guide for X/X-2 still be worth using?
90% of the information will still be correct. Some items/enemy stats have slightly changed. You will need to look online for details about things like the Dark Aeons. The official X/X-2 Remaster guide doesn't go into great depth about them, you will probably want to research that online.
Also avatars for everybody: