My biggest concern is the ability of the tile to survive something being dropped on it. Lately my kid dropped ~3lb pyrex dish on our current wood floor. There is a big mark on it.
Now, how would have either tile kind reacted to this?
No tile holds up to impact damage. I think porcelain would probably hold up a bit better overall.
With kids, anything you use is going to get trashed. When my kids were young I put cheap laminate in my kitchen and family room. 4 kids, a black lab and a cat did their worst for 12 years, and the floor didn't look all that bad when I pulled it out and put in bamboo.
I should also note that I'm not a fan of tiled kitchen floors, anything dropped that isn't made of metal breaks and/or chips the floor.