The best revision that effectively uses transition words to create coherence is:
"I can’t decide whether to go to the Beyonce concert next month. She is my favorite singer, and I’ve saved enough for the ticket. On the other hand, the trains stop running at midnight, so I don’t know how I’d get home afterwards."
This version clearly balances the positive reasons for attending the concert with the negative consequence of not having transportation, creating a more cohesive flow of thoughts.