Robosats or Peach since you're EU

Relai is great
Pocket Bitcoin is great too
Bisq and RoboSats are great too

Try them all and then stick with what fits you best. In the worst case you wasted some minutes.

A few exchanges in the EU here:

https://bitcoin-only.com/get-bitcoin

Nuri clients should definitely switch over to https://21bitcoin.app.link/invite/?code=4HGB8 (Note; Ref Link for an extra 0.2% off fees). It's the most comparable solution there is.

• Regulated & Licenses in the EU (Austria).
• Custodial account for noobs
• German Bank account with SEPA Instant.
• Super low fees (0.79%).
• Auto-withdrawal to your own wallet.

• https://21bitcoin.app <- KYC, but instant payments available
• https://bisq.network <- No-KYC, but nix sparplan ;)

I presume Relai is supported in Germany as well.
https://relai.app