Which are the better collections...
The HarperCollins Voyager omnibuses:
1:
At the Mountains of Madness
2:
Dagon & Other Macabre Tales
3: H
aunter of the Dark
... or the Penguin Classics ones:
1:
The Call of Cthulhu
2:
The Thing on the Doorstep
3:
The Dreams in the Witch House
I was going to wait until a Lovecraft omnibus was published as part of the Fantasy Masterworks series, but given that two publishers already have editions out, I don't think they'll bother.