Haven’t tried Tula or konny but konny is more for newborns ~ 2-3 months. Whereas Tula and Ergo can use longer (older). I’m using Ergobaby Omni 360, no infant inserts needed, baby is 13mo, still using occasionally (my back cannot tahan hahahha) 😄 You can also contact warabee (87767113), she can bring your requested carriers to (with a fee) let you try out to see which is suitable for you before you buy.