So far we have:

2 votes for the SINGLE OMNIBUS
3 votes for 2 OMNIBI
2 indifferent one way or the other
1 vote for 3 OMNIBI

[DEMAGOGUE MODE ON]

Do you realise that:

ONE SINGLE 1200 PAGE OMNIBUS would cost 100 dollars
whereas TWO 600 PAGE OMNIBI would cost 75 dollars each?

Not to mention a wait of 6 months (at the very least) between both books. How long did it take between TOMB OF DRACULA 1 and 2? One year?

Are you really willing to pay 50% more and wait a long time when you can have the whole shebang in one single, cheaper, hefty tome?

[/DEMAGOGUE MODE OFF]