I think this is a personal preference so go with what gives you the best sight picture. Having said that, I prefer the tactical rear sight (CZ-Custom) over the stock sights. I also replaced the front sight with a standard dot sight that I painted bright white. I love the FO sights, but the range I go to is too dim and the dot disappears so I prefer a simple white dot. Real easy to pick up in all conditions for me.
The stock tritium sights are pretty dim unless it is fairly dark and since I don't really shoot under these conditions so night sights just weren't useful to me. YMMV depending on what you plan on using your SP01 for. Its a great pistol ... I am completely smitten with mine

Paul