i'll be going with Avent just beacuse I read good things about them.
I'm glad you asked that!!
The Adiri Natural Nurser Ultimate Bottle is 100% polycarbonate-free and bisphenol-A free, and retains the features babies and parents love in the Breastbottle® Nurser, as well as offers the latest high quality materials, a graceful design, and the new Fill, Twist and Feed™ system, engineered so that a parent or caregiver can quickly prepare a bottle, even with a hungry infant under one arm.
When we need bottles I'll probably be going with these:
https://www.adiri.com/
https://www.adiri.com/images/photo_nn_all3.jpg
We have those in the US and have since I was a child (30 years ago)
They've undergone several design changes and now they are called Playtex drop-ins.
https://www.babiestravellite.com/Merchant2/graphics/00000001/Playtex-Drop-In-Bottle-large.jpg
This is what my mom used for her kids (the design available to her 25-30 years ago anyway).