Which race is more difficult, the 400m dash or 300m hurdles?

I'm running my first 300m hurdles race tomorrow. I'm origionally a 400m and 200m runner but my coach thinks the 300h will be a good event for me. I have no idea what it feels like to run the 300 hurdles so i need a comparison between it and the 400m dash.|||hurdles, you have to worry about jumping over things then running