There’s no one “best“ because different people have different requirements, budgets, use cases. So we need to get very specific with regard to what you’re trying to do in order to make recommendations.
First, since you are using Zooz, I assume that your hub has the US Zwave frequency. Please let us know if that is not the case as the device selection does vary.
And since you are using Zooz, I would first suggest getting in touch with support at www.thesmartesthouse.com They are very familiar with smartthings and usually very helpful (to be honest, these days they are often more helpful than Samsung support).
Motion Sensors
It’s important to understand that with the exception of camera-based units, almost all of the “motion sensors“ that work with smartthings are not actually detecting motion at all. They are detecting a very small change in heat as it moves across The PIR lens of the sensor. For this reason, placement is essential for good results. A lot of people think these work like a camera and they point it at the place where something will be moving towards the sensor. But that might make the item almost invisible to the sensor, and you will get a very long lag time (or what appears to be a very short detection zone). Instead, for best results you want to place the sensor where the item will be moving at 90° across the detection zone.
The following FAQ has more details and some graphics. (The topic title is a clickable link)
So your “end of a 25 foot hall“ is a very challenging set up for most of the PIR sensors. Usually in this kind of configuration the best thing to do is to put the PIR sensor on the ceiling pointing down, and that way it can detect the changes across the lens. You might need to put a little box around it if you’re trying to specifically angle the detection area. But again there’s lots of discussion of that in the FAQ.
For discussion of specific brands, see the following:
Latest Motion Sensors Recommendations? (2020)
Or (and this is where that budget question comes into play) if you go to camera-based motion detection, many of these do offer “activity zone” detection where you can limit the specific area that you want to trigger from. Usually works quite well, there are a couple of different brands you can consider, but, first of all, it’s a camera and not everybody wants one of those for privacy reasons, and secondly, they tend to be much more expensive and/or to have a monthly subscription fee.
But first, I would just get in touch with The Smartest House and see if they have any suggestions. This is a very popular brand in the community and again, with very good tech-support. So as long as you’re interested in zwave , they would probably be high on most people’s candidate lists. 