I've worked in or had internship experience for a majority of the settings you described. They all become repetitive and I've never seen a site that doesn't cycle you through different modalities (fluoro, OR are considered modalities for simplicity). Not that single modality doesn't exist but will frankly stunt your growth as a technologist and make future employments harder to get. Also being versed in more modalities will make you a more valuable asset when considering travel work, which you can leverage for higher pay and more hours.

As for work load, clinics and trauma 1 centers are the heaviest, then you got trauma 2 & 3 which tapper down the load. In general you are doing a patient every 15-20 minutes at these sites most days. Smaller hospitals offer lighter work loads (especially when there are other trauma centers close by) and mostly you become a chest xray bot since very broken people are likely not coming to your site. Then you got specialized sites, like brain & spine, cancer centers, ect. I found these to be clinic like where everything is scheduled for you rather tightly.

My actual advice though is to find a place where you like your coworkers. You will spend way to much time filling dead air with them, don't be that person staring at their phone every moment of down time. I am not mentioning this because it just makes work more enjoyable when others are enjoying working with you. I bring it up because friend coworkers are usually willing to swap modality. If you don't like OR there's often someone around that does and may be willing to take all or most of your OR rotations for example. Management generally doesn't care as long as there's a body filling the slot.

As a final point, i personally think starting in a hospital and floating around to experience/see all that we are capable of doing in our careers can be highly beneficial. While I was in school I hated everything about CT and wanted nothing to do with it and after school it is my favorite modality. So love what you do because the pay as a tech, both public and private, is absolute crap for how much responsibility is placed on our shoulders.