Batman all the way.
First off, Batman looks better, simple as that. He's more well known, and it's clear the Batman Begins film will be very serious and will probably contain more actual drama and what not.
Fantastic Four looks like it could be good, but I think the F4 just ISN'T movie material. Spider-Man? Yes. Batman? Yes. F4? Hell no!
Then again, they did make Superman into a pretty decent movie, so even the campest of superheroes have potential.
It's just that, well, i just think everyone, from comic fans, to Joe Public, to the critics, will enjoy Batman Begins a lot more - he's more famous, his character is still quite mysterious and intriguing, it looks like a serious dramatic film, and it makes people reminisce about the first Batman film - which although not truly Batman - is still a fondly remembered film, and I don't think Joel Schumacher has been able to kill off the interest in Batman at all, in fact, his dire movies have made us yearn for the old style, darker movies that Burton produced. While Begins is a far cry from Burtons movies, it still resembles them - a good thing all round - and hopefully it'll be the DEFINITIVE batman movie.
F4 could be the definitive F4 movie of all time, but I think it's just too camp in this day and age.
Batman.
i think batman will be a better movie, they´ve got nolan directing it, and he is awsome.
don´t know who is the director from F4, but i saw the casting and i didn´t get a good impression. Now christian bale for batman is a great choice, plus gary oldman, liam neeson, cillian murphy and ken watanabi are entering in the movie, great cast.
apologies havoc, but cash was quite old when he died, my sig is for people who were killed very young before their time. people who i admired. i left out several, if i knew the tags for a scrolling marquee id have loads of names. i was gonna put elvis and cash, but i thought they had established themselves so maybe there was no need. ill think about it anyway