You want the one with shell holders. Otherwise you have to put the brass in and pull it out. With the shell holders, the primed brass will drop out of the shell holder when you release the pressure. That frees your hand to be putting in the next case.
I have both. The Universal can be used effectively by holding two pieces of brass with your hand. With an unprimed shell in the fingers, use other fingers to pick the brass out of the springs on the primer tool, and then push the unprimed shell in. This is similar to how I process brass on a single-stage press, but the spring-loaded shell holder makes it more difficult to pull the finished case out.
Depending on the primer tray used to feed the tool, they sometimes need to be shaken or knocked to keep primers flowing. Both tools will occasionally push primers in sideways -- maybe 2 out of 100. To avoid crushing primers, you can push the primer up to the shell holder so it is visible, confirm it is oriented correctly, then load the shell before squeezing the last part of the stroke. It's slower at first than just mashing the handle, but with some practice it can be sped up and ultimately it saves time by avoiding sideways primers jammed in the primer pocket and preventing the case from sliding out of the shell holder, which usually calls for crushing the primer more until the case slides out.
Regardless, out of a half-dozen priming tools, the RCBS non-Universal is my favorite.