I have found that some varieties put out large, white roots while other varieties put out finer roots when trying to root cuttings. It is unusual to have the foliage die and then have a cutting grow successfully. Usually, if the leaves die, the cutting dies.
The roots you see might also be different based on the rooting method you use. I get larger roots when using wood mulch as my media and finer roots when using a good potting soil in fig pop bags.
The important thing is that you got cuttings to root and to grow.