No offense, but the moment I saw you posted in this thread I knew you'd pick survival because of your strongly republican leanings to a point where I was gonna be disappointed in you if you didn't choose it. Don't know why but that's just how I feel about you. :p
Anyway let's break this down it's a question of quality or quantity. Here's my way of reinterpreting the question: If you chose an eternity in hell over a second in heaven followed by your soul's death, I'd have to say that's a foolish choice because a sane person should not want to live in hell forever instead of immediately reaching their demise after a moment of bliss. So in that circumstance it's clear one would logically choose quality over quantity, or as OP worded it, happiness over survival.
However, we are usually not faced with such a black-and-white choice and though in the most extreme circumstances such as the ones I mentioned you would likely choose quality over quantity, in our normal human circumstances where one might be choosing to live a slightly less enjoyable in exchange for a slightly longer life, I'd say you would want to balance things just so that you are not dying really fast and happy, but also not dying really slow and unhappy.
The fact is, Spock knows best in that he does not try to choose between these two things, simply choosing "live long and prosperous." I would have to say the question in itself is too limiting for my tastes and agree with Spock, as why would one try choosing between the two in an absolute 100% of the time manner, when there is no absolute 100% of the time manner that works in either the scenario of choosing purely happiness or choosing purely survival.
Survive long and happily.