I got gifted both brands and have tried both with my LO, but she spits the TT back out immediately, but she does keep the MAM one in. I don't know which one is better in terms of development, but I know my baby doesn't like the shape of the TT ones. 🤷🏻♀️ But depending how often and for how long you plan on using them, they shouldn't have too much of a negative impact on baby's oral health. You might find (is not always the case either) that it does affect baby's latching if you are breastfeeding as the introduction of the silicone feeling can be confusing.
We went with Mam Comfort ones… they’re a bit more expensive but our baby loved them and now won’t have anything else!
We love tommee yippee natural dummies and mam bottles x
I have gone with Tommee Tippee natural only because I want to breastfeed and want to reduce the risk of confusion for the baby between breast, bottle and soother. I was against dummies but got them as a just in case.