Happybaby said that a middle man would be a better choice than a top man. I can understand that.
A balance is needed for the two sides of a couple. Top went with top. Middle went with middle. Then, there would form a harmony family.
Marriage is a long-term travel. If the one cycle of the bike is broken and can't be repaired, will you replace it. It is a forever homework waiting for you face. You may not meet it, you are so lucky. However, many couples will ultimately catch that dilemma. But viewed from the optimistic part, life is improvement, improvement is life.