[Lenny5160]

Personally, I'd stick with the two brands that you mentioned. I've used both and can't fully recommend one over the other. For example, I like that the Mega series can display the delay settings and dial-ins all on the same screen. But I also prefer the adjustment method on the K+R boxes, where each digit has a little switch beneath it.

You may also think about where you are going to mount the box and if having the wire terminal strip on the bottom or side would work better.

One small thing to consider is that the K+R boxes use +12V to the transbrake button, while the Digital Delay/Biondo boxes use Ground to the button. That becomes important if you are going to remove the box but still use the transbrake button. There is a very simple/cool way to wire the box so that the button will switch from Ground to +12V after removing the box and inserting the 'dummy plug.'