I’ve used the audio injector zero almost exclusively in my devices, and (touchwood) I’ve never blown one up yet althou’ I’ve convinced myself I have on a couple of occasions.
They seem a little bit noisier than the hifiberry components but I
m pretty sure I did some measurement of them way back in the forum somewhere but the actual levels seem consistent across them both so maybe it’s characteristic of the noise. Frankly from someone that used to accept bucket brigade noise on effects it’s really not noticeable but values change.
Where you have seen issues in the past is the startup of the audio injector. I’ve perfected a fairly detailed dance to bring them alive using alsamixer to go and turn on the capture facility, this then needed to be repeated for each restart ( which precluded the device from live as there was a lot of twiddling to get it all going again). But I would now say this seems to have settled down and it seems to behave itself perfectly. The pedalboard will restart on the reset switch and about a minute after you hit the switch the system is all up again with no problem. I would hasten to add these effects tend to be GUI crashes which I’m pretty sure are not audio injector related and again these are rare and I do dish out more abuse to zynthians than most, so don’t let this put you off.
It’s small size makes it very suitable for sticking into all kinds of cases ( My pedalboard uses one and the various zynths in tiny metal boxes do as well, apart from the hifiberry machine in a steel case which is hifiberry throu and throu.
The main element is you are off the beaten zynthian track so if you do have problems the help can be rather limited.
I’ve found the injector considerably more reliable and less xrunny than usb devices and the latency is very low. ( once again their are some measurements out there …)
As to the others I can’t comment as I haven’t tried them, but there is now considerable zynthian experience across the board so you can probably find someone to comment …