I had the pedal monster already and compared to other pedal boosters/adjusters I've used on other vehicles I really do like its adjust-ability as well as other features like reverse mode (pedal back to stock when backing up). It helps a lot with the pedal on these trucks and if that's all you're after then I'd say only go that route. I ended up buying the EZX for a little more power and to play around with since tuning for '22s is still a meh situation. I was going to play with the derringer since it can plug into the Pedal Monster as an extension of the banks canbus system(I also have some iDash gauges), but as it has been "coming soon" for an eternity I gave up on that route lol. I have also played with the pedal boosting in the EZX, but I just don't like it compared to the pedal monster. This being the case I have the EZX setup to leave the pedal stock and handle pedal adjustments via the pedal monster. So far as power I run the truck on lvl 3 which has given me a small increase in hwy mpg, a bit more get up and go, and doesn't seem to adversely affecting anything other than mildly increased DEF consumption.
The other features of the EZX are going to be achievable through AlfaOBD like disabling the foglight dropout, changing tire size/gear ratio, and enabling the current gear display in the instrument cluster. I had already done all of these things via AlfaOBD so I'm only using it as a box tuner adding a little bit of power.
Eventually once tuning is in a better place for the '22s I'll be ripping the EZX out and going with proper SOTF tuning. I've been talking to a few folks who work with some folks that are actively working on being able to bench flash a '22 PCM so that we don't have to do a PCM swap. Once that process is worked out I'll get some SOTF tuning for mine.