FUTO keyboard seems pretty cool! By default it switches to an enabled voice input keyboard when you press the microphone button, so you can actually use Transcribro with FUTO's keyboard! Better together! Of course perhaps you like their voice input or another voice input more. But it's good that they give you an option rather than being limited to only theirs! Transcribro might be a better option for you if you like how it has more buttons and some unique features compared to FUTO's. It's also around the same speed and accuracy as they both use the same underlying model. So give it a try and let me know!
Again, you can use the FUTO keyboard and Transcribro together. All you have to do is enable Transcribro's keyboard (the Start screen will guide you), and then make sure in FUTO's keyboard in Voice Input the "Disable built-in voice input" is on. After that, pressing the mic button should switch to Transcribro. If you'd like Transcribro to automatically switch back, you can toggle that on in its settings.