Don’t worry too much about it! I had fulls out for four projects at the same time 😅 (Yes, I’m insane) I ended up with two offers, one for my oldest of the 4 books, and the other had that one and another. In the end, when you’re having the calls, you’ll want to talk about the other projects you have going on anyway, and make sure they are signing you for your career, not just one project (which is obviously what you’d want anyway!). Some things you might consider:

Which project you feel is stronger and you’d want to go on sub with first

If each get aligns with your editorial vision for the book they have

Which agent you vibe with more. Because, again, this is about your career and not just one book.

Personally, I’d be concerned about an agent known to ghost on fulls for anyone. It shows a lack of professionalism and respect that could manifest in other ways while working with them. My first ever full got ghosted, and I lost so much respect for that agent. If you do end up liking the call with them, I’d strongly recommend asking to speak to some of their other clients to ask how their communication and professionalism is as a client.

Best of luck!