Ay, both are good options talaga, pero from what a few of us mums tried, Nan Sensitive worked better sa aming babies na sensitive sa formula, less vomiting at mas gentle sa tummy nila. Enfamil Gentlease is also solid though, kaya honestly depende pa rin sa baby mo kung alin ang mas ma-agree sa kanya, kasi bawat baby different talaga. Siguro try mo muna ang isa, observe for a week or two, then if still may issues with spitting up or vomiting, best to check with your pedia para makita kung may other concerns na.