It’s better to be alone and wish you were married than to be married and wish you were single.
To answer your question, I would say I would rather feel the former (the first one;)). However I would be most pleased with accepting and being content with my current state in life.
That’s just my personal opinion.
As a Catholic, it should be far better to be alone and wish you were married because if you’re married validly there is no way out for you, while if you’re single you can still meet someone else.