Whether the aesthetics matter is entirely up to you, we cant tell you what you do or don't like.
For me, aesthetics is a factor, but not a big one. If I have to choose between two equivalent parts with similar quality, performance and price, I'l get the one that looks better.
As for the actual benefits of heastinks on RAM, it is essentially none. RAM doesn't produce enough heat to get hot, and doesn't require any special cooling. Other components will fail due to heat before the RAM will. As long as there's a decent airflow through your case, RAM temp isn't an issue.