MarkA
Probably because this CAN stuff is a bit 'smoke and mirrors' for us, not techy old timers,I have gone with Motec and Link/Aim on my builds. They are fairly user friendly, have great support platforms (which I use), and once you get a handle on the software and data logging are a great tool for knowing what your engine is doing and making incremental adjustments. I've never been confident enough to lash out with Speeduino et al.
And destroying a Cossie is not an option.
I think it depends on the goal too, if you want to have every sensor under the sun for a full blown race car then CAN can be great. If you want a turn key classic cruiser CAN in my mind is kinda pointless. Most aftermarket engine ECUs (to a point of course) can operate a motor off just Throttle, Crank position and MAF or MAP sensors. Hell they don't even need O2 sensors, that's just getting fancy!
My goal is somewhere in between, I want it to run really smooth, be responsive without going down the rabbit hole. Hence the MaxxECU, it has a start up base map loaded on it already so once the car is together as long as I haven't stuffed up anything it should just start right up.