You beautifully explained both, along with these I believe that your surrounding highly affects your mood and way of thinking, being single will bring a feeling of freedom but then the atmosphere you are living in is keen to put millions of restrictions on you. Same is the case with married life it's a beautiful life only if you get the right human being, what if you decide to be with someone who don't even regard you as family and neglects all the love you deserve.
So if you ask which life is happier the answer is; it totally depends on the way you think about it i.e. own way of understanding as you described also, and how your atmosphere and surrounding makes you feel about it.