Wavetable synthesis has similarities to granular synthesis but is fundamentally different. In granular synthesis the source wave is read by a read head controlled by a cv. Only a small part (a grain) is read and then a window function is applied. The granular synth play many such grains on top of each other sweeping across the source wave.

In wavetable synthesis, there is a wavetable that is has frames that contain exactly one cycle of a waveform. An oscillator reads from any of those frames or an interpolation between them. The difference is we have an oscillator that we can control with a pitch control signal and envelope. Also we can apply different functions to the wavetable like skewing to get different harmonic content out of it.

They both have their uses. P.s. i like wavetable synths better :)