Hey guys,
Long story short, I am getting a set of Schwalbe Pro Ones for my 2021 season and I was wondering if some of you had measured the width difference between a tire on a hooked rim and the same tire on a hookless rim to see what's the actual difference?

Giant says that a 25c tire on a hooked rim has the same width than a 23c tire on a hookless rim, so I guess that a 25c tire on a hookless rim must be close to 28mm. My actual tires (came with the bike) are the following: CADEX Road Race, tubeless, 700x28mm (25c). I checked on the sidewall and it's indeed a 700x25c, but it seems like they are 28mm ''in reality''.
I am wondering if I should get 700x25c or 700x28c. What do you think?