I personally prefer the Delica, but there's really no telling which model one will prefer until they get it in hand, as I find to be the case with much of the Spyderco line. Many rave about the Native being and ideal EDC with perfect ergonomics, and I don't doubt that it is for them. I have a Native 5 LW and I like it fine, but honestly it left me with a bit of a 'meh' feeling compared to what the hype had me expecting.
Likewise, the PM2 is considered the quintessential Spyderco by many; but there are others (myself included) that vastly prefer the Manix and would step over a whole collection of PM2's to get to one Manix in a particular configuration. Then again, I'm quite fond of my Stretch2, which is often said to be in ergonomics like a LW version of the PM2. Go figure

. Plus, I'm a fan of the smaller Para3 even though I rarely like mini versions of knife designs

. There honestly doesn't seem to be much rhyme or reason for me when it comes to which Spyderco models I prefer, I just know it when I feel it.
Point being, both are great cutting tools that will serve you well, but although a poll will provide an interesting data point, I'm not sure if it can help you (the OP) make the correct purchase decision for you.
Perhaps it can help you decide which one to get first though