Trezor T nervt mich mit seinem 12-Wörter-Saatgut, sollte ich oder ist es eine gute Praxis, mein Trezor one zu verwenden, um mich mit 24 Wörtern Saatgut zu erzeugen und es in mein Trezor T zu importieren?

You will be fine .

Usage: trezorctl device setup [OPTIONS]

Perform device setup and generate new seed.

Options:
-e, –show-entropy
-t, –strength [128|192|256]
-r, –passphrase-protection
-p, –pin-protection
-l, –label TEXT
-u, –u2f-counter INTEGER
-s, –skip-backup
-n, –no-backup
-b, –backup-type [single|shamir|advanced]
–help Show this message and exit.

128 = 12 words; 192 = 18 words, 256 = 24 words

Have fun!

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>But would it be more safer if I do so?

When you lock your front door, do you put an additional padlock over the door lock? It would be safer if you did, two locks is better than one, right?

A 12-word seed is „unbreakable“, in the sense that nobody is going to run through all 12-word seeds to find yours. There is no point in adding more, because you’re already unbreakable. What would be more? Double-super-duper unbreakable?

Go with a 24-word seed phrase. Here’s why. In the future computers are going to become super computers and be able to crack phrases easier. The first one to go is the smaller seed phrase. Just prepare ahead.

I’d say it isnt more secure in practical terms but certainly a bit safer. with a 24 word phrase there are only 8 possible last words for any 23 words so a mistake is much easier to be caught than on a 12 word seed where there are 128 possible last words, and you can easily do a restore into an empty wallet and go panic

I would say you should think like your attacker. How much does it cost on an attack like that? And how much money do they think they can get from attacking you? Does it make sense for them to do so?