It looks likes the yes and no go for a draw. It sure stays a difficult dilemma.
I think this may always be the case for many areas. I haven't been where you're heading, but I had the same dilemma a number of years ago when I was heading for Central America. There was not as much information online then, but there was enough to be confusing.
I think the problem is that for many areas it IS so variable. Some particular locations - even though they are within a malaria zone - may turn out to have no mosquitoes (hence, no malaria). Some locations may have mosquitoes sometimes but not others. Some of your activities may make a difference (i.e. outside in the country at dusk vs. in town, etc.).
In the end, I had to get as much information as I could and then formulate my own plan. What I did (and this is speaking of the drugs from back then, so is probably only valid now as an example) was just take the anti-malarial drugs for the areas where Chloroquine was effective, because I didn't see too much negative/possibly scary about Chloroquine. To me that was a no-brainer.
Then I moved into an area where Chloroquine was not effective, where the effective drugs had more possible side effects, and where there was the additional possibility of the faster, more-deadly malaria (as I remember it now). What to do? I got answers of all stripes in my readings
What I did was procure and bring along the more "scary" drugs for the non-chloroquine areas (sorry, I forget which one it was now), and then I waited (which was a slight gamble) until I got there and could see how the mosquito situation was in my location (on the water where I had heard there might not be mosquitoes). As it turned out there were no mosquitoes there, so I never had to take that drug. I did take a risk but with the information I had, I deemed it to be my chosen risk over the risk of having a negative drug reaction.
So, in summary, where I was going there were no perfectly clear-cut answers, and there were people who would say "Yes" to either side of the equation. I got all the information I could and then made what I felt was my best decision(s).
Blue Sparkle