I really enjoyed both.  If you can only get one because of money then start with Demon's souls because you can play it for much much longer.  If you can only get one because of time get inFamous because it's takes much less time to beat.  Unless you are that insane guy who beat demon's souls in under an hour. 

I played both, but demon souls I dont like that much, ITS an AWESOME game, but I cant handle the depressive world...its killing my psyc!

i love the idea of the first infomous but the second one will be so much better!

get Demon Soul

Well I enjoyed both but here:

Demon souls: It a really good rpg but it is rather unforgiving at times, you'll get use to it quickly though. I put in 100 hours into this game I think. It gets rather addicting.

Infamous:An open world game with a guy with electric powers. Its a really good game that you can go anywhere and has alot of cool powers that can be unlocked. It has a karma system to that dictates if you're good,evil, or somewhere in the middle.That'll determine what abilities you can use.It was an awesome game overall.

So if you have alot of free time right now and like rpg's, you should get demon souls but if you like the whole open world game then go with infamous. Either way both are awesome games.

Watch the Zero Punctuation reviews and decide for yourself haha. But if you want my opinion then I'd say go with Infamous.

Demon's Souls

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They're both great games but inFamous isn't as unique and amazing as Demon's Souls.  You should get Demon's Souls while you can still experience the brilliant online implementation.