Looks like early blight to me cut the affected leaves off and plant should recover

It's not fungal, if all the leaves look like that. It could indeed be the fertilizer, if you think you applied enough to burn the plants... crispy edges like that are pretty classic. It takes a lot to do in tomatoes, though, and even if you take enough nitrogen out to stop burning it, you'll have to leach a great deal to get any fruit later. Keep in mind that any sort of toxic salt could have that effect, be it urea or sodium; I've heard of crispiness like that when someone is using especially salty manure or brackish irrigation water.

It could also be a symptom of inadequate water such that the plant dried out... you'd know better than I would how likely that is.

As for why one plant is affected and the other isn't, different varieties -- and even different individuals, with non-hybrids -- react differently to the same conditions. One may have a better root system, or tolerate salt a bit more.

--Alison

Thanks, they are in EarthTainers so I think they are getting plenty of water. I didn't think I added too much fertilizer but maybe it was too much for this variety.