Ohh comeon.

Two programmers, go head to head to make this app.

A programs with PHP+their chosen libs
B with Ruby+their chosen libs (probably ROR)

Which will make the best app in the least amount of time?

The best programmer.

The language may accentuate the abilities of a programmer, may make it
easier or harder to do some things, but unless they are really bad
languages, it's mostly down to how the programmer uses them, and how
well they know them.

PHP isn't my choice of language, but I know it well enough to know,
it's not a terminally broken language: you can code well in it.

--Kyle