I'm the wrong person to ask about how Delica compares to Native from a personal preference perspective, but I have both handy and I found my digital calipers. Sorry for the shaky hand blurriness in some of the photos.
I like the ergonomics of the Native more than the Delica, but I'm pro choil and anti gap between the scales and tang, so Native automatically wins out over out-of-the-box Delica for me.
I have average sized hands for a woman and the Native is perfectly comfy. My boyfriend has average to large-ish hands for a man and he also finds the Native perfectly comfy. I tend to like 3" blade length or smaller knives the most, and he generally prefers Endura sized knives or bigger. We find common ground in the Native, apparently.
I don't have a problem with the thumb ramp over the hole on the Delica, but I really like the lower profile of the Native's spine. The gentle curve makes it feel like the tip of the Native's blade is lower so you don't have to angle your wrist as much. Could be that's just an optical illusion making me think there's a functional difference, though.
My biased opinion is Native is worth trying out, not necessarily as a Delica replacement, but as another Spyderco EDC option to add to the rotation.