I prefer a physical keyboard that literally disappears when I'm not using it.

Seriously, your question is bad because it ignores the inherent trade-offs in the decision. An on-screen keyboard isn't easier or faster to type on, but it allows for a larger screen and probably cheaper manufacturing costs.

You have to mention the trade-offs if you want useful information from your question. More like: Would you rather have a powerful engine that gets mediocre gas milage, or a mediocre engine that gets great gas milage?

Otherwise you'll just get everyone saying they want the powerful engine.