My hybrid bike came with 28c tires and I'm looking ahead to when I'll need to replace them. I was wondering if, when the time comes I should get another set of 28c's, or would I be better off with a narrower tire. I guess what I'm really asking is, generically speaking, what's the difference between 25c tires and 28c tires? How do 25c's feel, compared with the how a 28c's feel? Is one safer than the other? Is one size less prone to flats?

I should probably mention that I only ride my bike on paved surfaces.

Thanks for any answers you can provide me?