The best cup is the one that suits you best!
We all have slightly different anatomy so asking other users isn't really going to help.. however what we can do is guide you in the right direction..
FIRST TIME CUP USERS
Teenager or never used insertable menstrual products before.
You going to need a small short stem cup... The Tulip Cup will be your best option. It's smallest and petitist cup.
Because you will either have a high or low cervix we reccomed our duo pack .. you will get one Tulip Cup and one Blossom Cup