I applied to two postdoc positions to two different groups at the same institution.
I've got to the interview stage for the first position. After the interview, they want my opinion, if I still want the job. I am aware that the topic is interesting and important but I am not so excited about the topic (and I do not need the job immediately).
How should I respond to them when I don't know the fate of the second application? I would prefer the seconds position, because it is more exciting for me. And I do not want to cause any offence to the first group. It is a research institute and I am sure these group talk to each other regularly.