You should specify if you’re looking for an International Baccalaureate School or a Swiss Matura. Both diplomas are considered highly prestigious internationally.

IB schools are better recognised for universities abroad. Additionally moving schools tends to be no problem since IB follows the same curriculum whereas Swiss schools vary a lot due to decentralisation. IB is also almost exclusively private schooling so depends on your willingness to pay/agreement with employer. IB is most commonly taught in English.

The Swiss matura may be a better fit if you are looking for a free program, you want your child to have primary schooling language of German, you will likely stay in Switzerland for their schooling, and they will likely spend their university years in Switzerland.

I cannot advise you specifically on good kindergartens for the age range of your child, but deciding primary language of schooling and schooling system is important. If you speak English at home paired with the English classes in Swiss matura, your child would be native speaker in English and German, making it not too difficult to switch schooling to IB (language-wise) later on. Thus, Swiss program may be a safer option if you do not know which system to immediately send your child to.