If you are dumb, lazy or just bad, you rely on just those tools. If not, you figure it out using basic math. It's not hard, even public schools can't screw up the teaching process of basic match. Yes, this might be blunt and rude, but really, become a better player. Figure it out on your own so you know WHY one stat is better than the other. Once the internet is gone, what will you do? Survive successfully I hope, because you learned how to do things for yourself rather than be told how to wipe your own......
The choice should be which stat to reforge, not which tool to use to tell me how to play my class. Run a WoL, use those number because they are more realistic than FD. I have nothing really against these tools, and actually use them on occassion to compare my numbers I worked. Comparing real number(WoL) vs sim numbers plays more to your style and the encounter mechanics. Sims are just that, simulations to Patchwerk like fights. And don't forget all the other issues those sims have, i.e' not reading socket bonuses, not having the gear listed you have equipped, etc.
Felix Baumgartner didn't just rely on sims when his team researched the world record skydive. He went straight to the source of the guy who did it before, getting real info, real experience, real research.
TL
R - Stop being lazy, do the minimal research or the zombies will get you.