IMO you're comparing apples to 2x4's
The DC technology makes these reels completely different.
The Curado K even when the casting brakes are all on, still requires a decent thumb to control. If you are using heavy baits, the Curado K has an amazing free spin and will get away from you quickly. If using light baits, the Curado K works magic with little effort.
Now to the DC, folks that like them LOVE them, folks like me that don't like them, HATE them. The automatic spool control does a great job at controlling backlash. However, if you've never fished one, I'll try to explain why I don't like them...
If I want to make a long cast, one that you'd normally put a lot of zip on to get your bait out there (you seen schooling fish just out of reach but are going to try anyway), the spool control determines that the spool is spinning very fast and starts breaking it, the harder you cast the quicker and harder the braking takes effect. All this means you can't cast as far because the computer is telling the spool the angler screwed up and it needs to fix it before backlash.
Then the opposite can happen. Say you are close to a tree and want to just do an easy side arm up under a tree limp. Well because there is no quick spool movement, the computer doesn't react and the bait over shoots the target and makes a large splash down because there was so much line, even a thumb on the spool can't slow it down.
Fishing a DC is confusing to me. That said, this is just my experience and opinion, their are millions sold to anglers that LOVE them.
Between the two, I'd keep looking and find a Curado 70
I have several SLX reels that I'm trying to destroy. However they are a hundred dollar reel that is taking a beating and doing very well. Don't know if that helps...