I use SimC. Pretty straightforward and pretty accurate results imo.
Sure... it has some flaws. For example not using shoulders + subterfudge properly - but I dont mind because I dont have shoulders yet.
And ye... some trinkets are not getting handled correctly (even though you can implement some "use-actions" for it).
But for me, in most cases its about small decisions (thats because I already got 910~ equiped GS and there are not many changes anymore).
With the "SimC" Addon its pretty easy to edit the Simulation text (type /simc ingame). So... ye - for me thats enough - I dont need anything else
Regarding AMR: I was trying it out some months ago and the damage calculations were totally off. But maybe that changed by now but I have no need for it as I am used to SimC now.