out of the 2 i'd pick the emx1 as it has the synth sequencer - on the esx the sampler is ok but you need to write samples to an sd card - i just didn't use it ended up just using samples in my software instead.
seriously you might be a beginner but i know (as i did the same thing) if you get the korg in a year you will wish you had got the elektron (i wish i had and its on my shopping list).