Mercule
Adventurer
I'm torn, on this one. I've run a few games using just my iPad, and it has ups and downs. At the same time, I'm likely to buy a whole shelf of my "chosen" game, and that's hard to lug around.
I think my preference would be the same as for the tech books I buy: dual release. I pretty much only buy from Manning, anymore, for that reason. I get the ebook/pdf to actually read cover-to-cover and/or search, but have the pbook to lend to others (for tech, it's proselytism ; for RPGs, it'd be to bookmark and quick-flip between pages at the table). I'm not going to buy them twice, though, in most cases.
I think my preference would be the same as for the tech books I buy: dual release. I pretty much only buy from Manning, anymore, for that reason. I get the ebook/pdf to actually read cover-to-cover and/or search, but have the pbook to lend to others (for tech, it's proselytism ; for RPGs, it'd be to bookmark and quick-flip between pages at the table). I'm not going to buy them twice, though, in most cases.