Knibbza

Hello I have a 2019 giant fast road sl1 and want to switch the slicks (700x28c) to a more gravel/trail friendly tire.

I’ve been given the gravelking sk in both 700x32 and 700x28 I am just wondering what pros and cons to the sizes would be.

also as a point of reference I recently had a inflamed prostate due to over ridding and had to take approximately 4 weeks off (on road) ridding I have since changed to a more cushioned saddle, hopefully that will help.

thanks in advance everyone.