QWERTY, simply for the convenience of never having to be on my device in order to type anything at all. Sure, it's still awkward to use someone else's keyboard as your muscle memory is built up for your own, but at least you also don't know to contend with a straight up layout change. I get that the alternative layouts are technically better, but there's something to be said for standards and the friction that is generated when you try to stray from them.