I've flown the Cirrus some (~25 hours) and it's a heck of a nice airplane. (Non-turbo. Haven't had the chance to fly the turbo yet.)
The handling is simple enough with a distinct pre-stall buffet. The aileron/rudder interconnect makes it so you can pretty much fly it with your feet on the floor.
I've found the Cirrus to be really easy to fly.
The control loading doesn't have particularly distinctive aerodynamic feedback, it sort of feels about the same regardless of speed.
You can hold it deep into the stall and do the "falling leaf" thing without anything weird happening, provided you keep the ailerons neutral and are deft on the rudders. (Do this with an instructor on board, please.

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Steep turns, stalls, maneuvering are all a piece of cake and it's nice and crisp in roll. It just powers out of stalls, just like I assume the Columbia would.
Landing is a piece of cake: 80 knots, full flaps and just eek the nose up a hair when you think you're about to bury the nosewheel into the pavement. They land a bit flat when compared to a Cessna 172/182.
The chute is a nice backup, not just for an inadvertant spin but for loss of engine power over hostile terrain, loss of control in IMC, loss of some airframe bits, mid-air collision, etc.... Just don't get into the "Well, I have a chute so I'll try something I otherwise might not" mindest.
The Avidyne/Garmin/Stec combo is pretty sweet and simple to use. I've not compared it back-to-back with the G1000 but would guess it just comes down to a matter of training and personal preference. There's going to be a learning curve with both systems.
Dunno about the Atari aspect. The old Arnav MFD was pretty 80s looking but those haven't been installed since 2000 or so.
Service support would be a key factor were I in a position to choose between the two.
As for published speeds, I dunno, I guess that's just a matter of what the typical mission is. For a bunch of reasons I'd rarely, if ever, fly a non-pressurized airplane to FL250 so the top-speed at max altitude doesn't matter much to me. Your mission might be different, of course.
If was going to be flying routinely above 12,000 I'd prefer pressurization. Once you've flown something pressurized it's hard to go back.
An early-model Mirage can be had for about the same money as a new SR-22/Columbia (albeit with higher maintenance costs) and a Malibu can be found for $100k-$200K less, which pays for a lot of maintenance.
I've not flown the Columbia but they look like a wonderful airplane as well.
I do like that the Columbia has speed brakes.
Getting an SR-22 to slow down and come down while keeping some heat in the engine can take some doing. It's not a big deal, but there's been a couple of times that I wished I could pop out some boards to make a crossing restriction without pulling out too much power too quickly.
Good luck and enjoy the demo flights. You could probably flip a coin and be perfectly satisfied. It's a good problem to have, eh?