Hi
What is the best app mobile to trade p2p (like bisq and localbitcoin). That can I fiat money eur, usd... to buy Bitcoin?
Those two P2P sites you mention above are best as of now no other than that are the best.
For the mobile wallet app if you are going to hold Bitcoin then you should look for a wallet app that you can have full control of your wallet(With Seed or private keys).
I have two options that I know the best for Android Electrum and Mycelium.
For multi-currency wallet you can use Coinomi wallet.
Other options can be found from here
https://bitcoin.org/en/choose-your-wallet?step=5&platform=android
Coinbase is what comes to mind for being the biggest and best app to buy bitcoin with fiat. There you can buy cryptocurrency by using debit card, bank transfer, SEPA transfer, and more.
Coinbase is not a P2P exchange.