first one was a little bit of a waiter. intro is too long/ not enough happening. and when it does come in, the snare is way too subtle - in general the mixdown is lacking a lot! the intruments dont really cut through hence making it boring to listen to.
switching the style for the second, i like that! but again, the snare needs some work and i cant really work out when it drops (think its lacking some sub aswell) which would make it very hard to mix in.
third one is the best so far, but you got to work on your mixdowns, the sub is too loud and the synth which starts at the beginning aswell.
try to put some work into your drums (they dont got enough impact..), mixdowns, name your tunes and keep at it!