Wheat and barley stand in stark contrast to each other. The wheat kernel has many layers of protective covering while the barley stands bare and exposed to the elements. Despite this difference the fact is that on the whole wheat does not fair any better than barley. In fact wheat encounters more problems than barley does. Why is this?
The Kenaf Renanim explains that when it comes to dealing with problems the poor man is far more adept than the rich man. The rich man thinks that all his wealth and connections can solve his problems and he throws all his resources and expends a great amount of energy to make the problems go away. But life doesn't work that way. At the end of the day he will need to come to the conclusion that the solutions lie only with his Father in heaven. So after running himself ragged he will finally look up to Shamayim and shed a tear for a heaven sent "Yeshua". On the other hand the poor man cuts right to the chase. As soon as there is trouble he knows he has nothing to hide behind. For him, his trusty Tehilim is his first and only option.
The rich Chittah with its many protective covers says "Shir Hamaalos" a song from the person with all the "Maalos", the person who has it all. "Mimaamakim Korsicha", after coming down many levels and finally humbling myself before Hashem only then from the depths I call out to you Hashem and hope that you are still willing to listen.
The bare Se'ora says "Tefila L'Ani Ki Yaatof" a Tefila from the poor person who is wrapped in trouble. "V"lifnei Hashem Yishpoch Sicho"; he doesn't need to call to Hashem. He is already standing before Hashem because he relies on him for everything since he can't do anything himself.