To be fair - it's all about what exclusives are important to you. If Tomb Raider is more important to you than, say, Uncharted 4 - then maybe the XBone is the choice for you. It's worth remembering that TR probably won't be out for 12 months, so what games will you miss on one platform in that time? Is there anything in the current library to drive you one way or the other?
Finally, it's always worth considering getting one now, then trading it in if it doesn't work out for you and you're still tempted by a later released title.
I think Microsoft have woken up to the fact that at every show, Sony demonstrate a massive breadth of different games, but MS have lots of multi-platform or similar action game types. Their diversity on the XBone isn't apparent - and when the industry has settled like it has with no real difference in hardware between platforms - it's games that are vital.
I'm not fanboying here BTW. A lot of the games Sony show are indie games that have already appeared on the PC, or are cross platform somewhere. They're just very clever in showing off a lot of different flavours - so it looks like there's a larger number of games available on the PS4.
Also worth noting that a lot of the indie games Sony pushed (and are pushing) are also now becoming available for the XBone. MS are slow about demonstrating this for some reason. I don't know if they're scared of driving off "their core", or just don't really understand why a £5 game produced by two guys for £60K is more popular than a £50 game that cost £300 million to make - so they ignore them in the hope things will make sense again.
As for Tomb Raider? It looks like an odd decision for Crystal Dynamics. When you consider that the last game only made a profit through sales on the PS4 and that Sony sales of the game were more than double MS', it doesn't on the surface look like a clever move.
However, if MS have offered to pay for the development of the title on one of their two platforms - then that's a huge chunk of risk CD don't need to shoulder. Square Enix were vocally disappointed with sales of the game - so they will have been stopping support for the next title, or cutting back budgets. So CD can use MS to get out a game that otherwise may have been binned - or consigned to "give it to some lesser studio to chuck out any old crap on your last engine".
There's a chance this was Crystal Dynamics only opportunity to make the game.
From the MS point of view; it gives them another exclusive, it gives them a game that sold very well to Sony owners and it's a game they can put up against Uncharted 4.
I think what they're missing is that it's not a brand that will have people buying their console for. TR sold okay, but it wasn't a massive hit. People with Sony consoles will almost across the board (with me and you as exceptions Marc) choose Uncharted over TR. TR was bought on the PS3 because people loved Uncharted and it arrived at the right time after the last Uncharted game (about the same space of time the next one would have arrived). Uncharted didn't sell Vitas though and I'll bet if TR had come out at the same time as Uncharted 3, it wouldn't have sold as well on Sony. So the chances of people making the move and buying hardware for the game are slim.
So I can understand it, but I don't think it's a good decision by MS.