Ah right. Yes those (Manfrotto?) pistol grips are like that, very fast and easy, but hard to be accurate for critical work and always move a fraction when they lock. Sold mine

In fact, many/most ball heads move a tiny fraction when you lock them down, though not the best ones. Three-way heads are more reliable in this respect, and better for careful positioning, but slower to use. M'frotto 405 is very solid and precise, but very heavy and not cheap.
Without knowing more about intended use, lenses/weight, and budget, it's hard to say much more. All I can add is I use a 405 head on a big Benro tripod for studio, and a Gitzo Explorer with Arca-Swiss P0 ball head for carrying out and about.