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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If I can bust in here OP, I have to say a good strategy is to have those without a good missile launcher to fall back on the corrective measure from VoG. I have used it on Crota and its not to bad to drop his shields(I since have found better). Another suggestions is to swap icebreaker for VoC or Pat&Tim if you don't own one. With a solid team ice breaker should not be necessary. Just my two cents.