Formula for mixed feeding

I tried NAN as they said closer to breastmilk but my baby is super gassy still. Then S26 was a good fit to my baby, he stopped farting every hour, less bloated stomach and poop nicely. But I truly think every baby is different, you need to trial and error. Haha

I previously do mixed feeding with Nan Optipro HA. No issues for baby and is said to taste the closest to breastmilk. (Never tasted both milk so I can’t confirm on this)