If I were going to be shooting the situation you describe, I wouldn't even consider Tv (shutter priority) mode. For me, the question would be whether to shoot in Av (aperture priority) mode or in manual. And this is not a decision that has to be made ahead of time. In fact, most of my shoots involve a spontaneous mix of both aperture priority and manual shooting.
The reason I would not use Tv mode is because YOU set the shutter speed and the camera picks an aperture to match. Unfortunately, the number of suitable apertures is quite limited. In other words, the camera does not have many suitable options when it comes to aperture choices. There will, in many situations, not be a properly matched aperture, and then the camera will start jacking up the ISO.
Additionally, and perhaps more importantly, aperture has a huge effect on depth of field. Do you really want the camera to decide how much depth of field your images will have? Isn't DOF an artistic decision? And, if so, how will the camera - which is a computer - know what kind of look you want the images to have? As the artist, you should be in control of what your images look like, not the camera. YOU should be deciding how much of the scene should be in sharp focus, and how much you want blurred, as well as how blurry the out-of-focus areas are.
Except for specialty situations such as panning shots, shutter speed generally has less much effect on the final look of the image than does aperture. So, it is normally ok to allow the camera to pick a shutter speed to match the aperture you have selected (shutter priority mode). Plus, there are far more shutter speeds than there are apertures, so the camera will be likely to fun out of suitable choices when it attempts to find a shutter speed to match with the aperture you've selected.
The one time when Tv mode would typically be a good choice would be when you are doing panning shots in which you want the background to have pronounced streaking in the direction that the camera is being moved when you follow the subject. In this specialized situation, the shutter speed has more effect on the look of the final image than does the aperture. Therefore, the shutter speed is the artistic part of the decision, and is best chosen by the artist (not the camera).
"Your" and "you're" are different words with completely different meanings - please use the correct one.
"They're", "their", and "there" are different words with completely different meanings - please use the correct one.
"Fare" and "fair" are different words with completely different meanings - please use the correct one. The proper expression is "moot point", NOT "mute point".