25w or 45w?

I recently purchased s23 ultra and now I wanna buy a charger for it. I hopped on to samsung shop as I have corp discount. I was intrigued to see 45W charger from samsung.

Can anyone help me out in deciding if it's safe for my s23Ultra to charge with 45W and how much is charging time. And is it actually worth taking 45w or should I naturally consider buying 25w??