I chose ONNI because I attach great importance to natural ingredients.
The orders are uncomplicated via the shop and the delivery of the goods is fast.
The products are easy to use and the consistency and smell are very pleasant. My hair feels healthy and has a nice shine. I can't rate anything about the serum, also against hair loss, because I haven't been using the products for that long.
With the travel sizes, a pump dispenser would be ideal for the conditioner, since the bottle is very hard and the contents are difficult to squeeze out of the bottle. Maybe consider changing that.
If that's true with the ingredients, I'll stick with ONNI.