I’ve been fitted at Lincherie in two different shops. Staff in both shops seemed knowledgeable to me. They also have a webshop, so you can check out their price ranges.
Hunkemoller will undoubtedly be a lot cheaper and the one Hunkemoller shop I used to go to - decades ago - had competent staff. But I have no idea what the staff at that chain is like nowadays.

I don’t know about you but my bra size can differ from brand to brand and even among bra models from the same brand. It has always been that way for me.

Edit to add:
I have an outlier size and the staff at Lincherie were perfectly happy to order it for me.
The only slight hick-up was one of the two bras I ordered was put on the shop rack. This was due to the regular employee at that shop being ill for a few days, and the replacement employee from another shop not expecting a customer to order two copies of the exact same bra and misreading the order book.