The Democratic system results in no true wasted votes.
How do you define "wasted votes"?
Votes cast for a candidate that do not result in them earning any delegates.
I suppose there are a few, for example, any Hillary supporters in western Idaho wasted their votes. But nowhere near the GOP level.
Still not sure I follow this logic. Allow me to elaborate on my confusion:
Compare two different voters. One votes in the Dem. primary in a CD with 4 delegates, where everyone knows that neither candidate is going to get the 62.5% of the vote needed to split the delegates 3-1. It's clear that the split is going to be 2-2. The other voter is voting in the GOP primary in a WTA state where the polls show that it's incredibly close. Now, if the candidate selected by the GOP voter comes up short and doesn't win that state, his vote is "wasted", whereas the votes of all of the voters in the Dem. primary in that 4 delegate CD "counted"? That seems like a strange way of looking at things.
I mean, if that one voter hadn't shown up at the polls, there still would have been a 2-2 split, so his vote didn't really change anything. The vote only "counted" in the sense that if a large number of other people in the district had voted differently or not at all, the outcome would have been different. But the exact same thing can be said in the WTA-by-state system. If you want to call the votes for a candidate who didn't win a state "wasted", then you can equally say that all votes for any losing candidate in any election are "wasted".
I think that the more relevant question is "what is the probability that a given vote will change the outcome?" To make the system "fair" you should ideally make it so that everyone's vote has an equal probability of changing the outcome. This doesn't happen in any WTA system because some states are much closer than others. (But the same is true in the Dem. system, because of how things are allocated by CD.) But that's the way I'd look at it, rather than set up a dichotomy in which some votes are "wasted" and other aren't.