The Deuce has very, very little in common with the Challenger 850, aside from the tube that they share. The Challenger 600 series is what you’re thinking of.

Similarly the 7/9 have almost nothing in common with the Global Express series.

145s have FADEC, right? That’s pretty nice over the 200. I don’t really mind flying the 200 though

And you would be wrong, a Challenger 850 is literally a bizjet CR2, while a Challenger 870 is a CR7 and a Challenger 890 is the CR9.

The Bombardier Challenger 800 was the largest super-midsize business aircraft offered by Bombardier Aerospace. It is based on Bombardier's 50-seat CRJ200LR. The Challenger 850 is the updated version.

Source: Wikipedia

Yeah, if you’re gonna just compare the tubes... they’re the same.

that's like asking if you'd rather eat cat poop or dog poop

I'll go with cat poop

Pick the one that gives you the best QOL. At the end of the day most of people’s complaints about each airplane are totally insignificant in the grand scheme of things. So the -200 requires you to manually transfer the bleeds and set thrust. Cry me a river.

The 145 wins with:

Cooling
Performance (kind of)
FADEC
A/P can do a two engine G/A which is a neat trick.
Some of the systems are slightly more automated.

The 200 wins in every other aspect.

I’d take the CRJ for the avionics alone. The refresh rate on the 145 screen are horrible. Feels like the days of playing flight sim on a slow computer. Only thing I like about the 145 is the auto anti ice and the electric pedal adjustments.