Welcome to the community, Shelly! The “best” might be subjective, and like you said, there are not a ton of options, but two major brands to consider are Forest River and Coachmen. Each brand has a few pop-up camper models with bathrooms and I believe they all can be had for less than $25k new. You can learn more about the exact models here: https://camperfaqs.com/pop-up-campers-with-bathrooms
That only includes tent campers since you specifically mentioned that, not A-frames, or hard-sided popups, which some like to lump into the same category.
Hope this gets you started down the right path.