We already know the full data set has a 1.2K/century trend (this is annual trend most commonly used to represent the data). Decadal moving averages aren't going to shed more light than that. We also know that if you just grab the last 19 years and 6 months, or any smaller subset of that, you'll see 0 to negative trends.
But they're the best data we have. They have the widest coverage, the least uncertainty. At nighttime the SST satellites can have over 10C of error due to cloud cover. I've no doubt the earth is warming. My doubt is that measurements with wide confidence intervals should be used over those with low confidence intervals because they tell a more compelling story.
