RE5 is much better. but, have we talked about this before?? hehe I think so... 800+ pages to look after..
The boss battles for RE 5 and the co-op mode are great. Dead Space is all about repeating the same thing for the first level til the end in places that looks the same (and some times ARE the same)... and no good boss there (with pretty much only 2 trough the game... some tentacles and in the end... guess what? more tentacles! hehe)
And I´m not even start talking about the charism of the characters... Isaac is a door! LOL he doesn´t talk, he doesn´t question anything, just a puppy following orders... I hated him.
SPOILER!!!
So yes, I LOOOOVED the ending.
Chris, Sheeva, Excella (beautiful...), Wesker and Jill are way much better characters.
I could go on... for me Dead Space was just an average game (7/10) while RE5 competes for GOTY this year.