The tidegauges combined with co-located GPS receivers are more accurate (realdata) and produces a value around 1.3 to 1.8 mms / year of sea level rise over about 150 sites across the world.
As we have shown in Rahmstorf et al. (2012), much or most of the decadal variations in the rate of sea - level rise in tidegaugedata are probably not real changes at all, but simply an artefact of inadequate spatial sampling of the tidegauges.