bassy;
the difference is people are calling trump a fascist, but he isn't actually one. the issues he is concerned about are similar, but his solution is different. he advocates giving power back to individuals, not taking it away. he wants to reduce government regulations, not add to them. sanders however advocates for socialist policies.
socialism is actually closer to fascism than you might think. (it's the first step towards communism) how do you take back the means of production if not forcefully? how do you regulate the market if not forcefully? socialism requires more government oversight and control.
with free market capitalism the market is determined by the buyers. what they need, what they want, what they are willing to pay for. competition drives prices down and quality up. with socialism the government decides what will be produced and what price it will be sold at. it takes away competition and incentive to innovate. the main argument for socialism is that the gap between rich and poor is unfair, but what they don't like to address is the fact that under capitalism, the poor are much better off. margaret thatcher addressed this in one of her speeches, "so long as the gap is smaller, they'd rather have the poor poorer".
here's a clip from margaret thatcher on socialism:
https://www.youtube.com/watch?v=okHGCz6xxiw