What is more important in astrology,houses or aspects?

houses...
i dont totallyunderstand aspects but there are good articles at astro.com

It's like comparing apples to oranges.

Houses are the different areas of your life.

Aspects can be between planets, houses, house to planet, and they too, play an important role in interpretation of your chart.

You must take both into consideration.

Both - A well placed planet when receives bad aspects then it will not be able to produce good results.

Some babble about anything in astrology. Signs give the color of its nature while a planet in it, will tint the sign's colors with its own color causing a blend of both.
This said, a sign is a sounding board; how it will sound depends on the planet in it, and where it will express, depends on the house.
Aspects will show if the action will be easy (good aspect) or difficult (bad aspect).
Briefly, you have signs, planets, houses, and finally aspects.

Houses show the area of influence, as will the sign there as to the kind of potential energy. But the aspects to planets in those houses will show how the energy is specifically manifested. If there are no planets in the houses, then you look to the rulers of the houses and the aspects to those. Aspects are needed to set the energies off, cause something to happen. Transits will also stimulate the energies.