I have been using bitcoin-only firmware on two of my Trezors for years now. It is easy to mount trezorctl on a linux terminal and install the BTC only firmware. For more casual users the Suite's software will now make it easy to install.
Many here say their devices run well with "normal" many coin software. I can't speak to that since I am a diehard old school crypto user from a decade ago now. I do have more devices where other coins can be used.
Security advice: it comes down to attack surface and CLEARLY bitcoin-only firmware has a total edge over the "normal" firmware IF in fact you are only using Bitcoin. Why would anyone expose attack surface unnecessarily? Further some of the updates with all the coins need to be corrected because something is glitched or changed by the respective coin blockchain/system. I worked in computer security and I believe Trezors are safe, but I maximize my security when possible. Why wouldn't I?
Trezor finally introduced an easier way for "normal users" to directly install the Bitcoin-only firmware in Trezor Suite!
Note: Bitcoin-only firmware existed "since 2019", but it was meant for advanced users.It's important to ask if Trezor allows it's users to move back to multicoin firmware after they installed bitcoin only firmware, maybe they changed their mind or they need to use this device as 2FA?
I know that Keystone hardware wallet is also allowing it's users to choose between bitcoin-only and multi-coin firmware, but you can't change your mind and install multi-coin firmware again.
Benefits for Bitcoin-only firmware are obvious, it's much more secure, clean code, less bugs, and no shitcoin distractions.
I can move back and forth between software ------ > bitcoin-only & normal software as often as I want to. Easy to do!
You can even do a factory fresh wipe including the firmware and start from factory scratch if that is your thing. I have done that too at least 10 times for confirmation with my test Trezors. Promise you its fine if you have your SEED ------- > FOR SURE