Atheon is harder, and not even just on level 30 atheon is much much more of a deserving boss than Crota , Crotas apparently difficulty is an illusion!
If you find it hard , or haven't completed it do not fear it's nothing to do with what you can do it's what you don't have! ... Sorry
If you do not have a legendary or exotic tracking rocket launcher and/or icebreaker then you better just use the sword or shoot at some thralls or something because you are literally doing absolutely nothing , I'm sorry don't want to try and sound keen, I'm not getting all high on my horse because I have Icebreaker, hunger of crota and I spend almost all my strange coins/glimmer on ammo synth ,
I am just stating that it's unfair, and destiny rub it in more as the few other weapons outside of Gjallahorn and icebreaker needed to defeat Crota , are only dropped ..... By crota
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The problem is not the fight, the problem is the people who you are fighting with. Doing Atheon with mostlly 30s meant you had people who were mostly veterans. Doing Crota with a bunch of 30/31s means very little.