At least, if they hit 100K as they should, you'll get both PDFs. So go for the S+W hardcover and you've got the stats in the PDF if you end up running it Probably what I'll do I think.I'll get a Hardcover once I've decided which one to get:
Pathfinder - not to keen on the system but I'll find tons of players who'll want to jump into a Rappan Athuk campaign if I run it.
Swords & Wizardry - The one I'd like to have for myself but will have more than a hard time to find willing players.
At least, if they hit 100K as they should, you'll get both PDFs. So go for the S+W hardcover and you've got the stats in the PDF if you end up running it Probably what I'll do I think.
Now let's all hope they make the 100k.