Ask agent 1 if you would be pushed for newer clients or if she puts clients in the queue to wait their turn. Also, check up on them with query tracker and other agent review sites. Maybe post a "what do you know about them" on here. But unless she would be pushing you off indefinitely for newer clients or has a bad reputation, she sounds like a busy and industrious agent. I would do my homework but if nothing bad came back, I would probably take it. She would likely give you work to do on the manuscript or something new as well.

I would not go with any agent who was not willing to share their history or sales record. Agent 2 would not be my choice.

Congratulations and good luck!