D855 Factory reset issues

I have a question, what is the cleanest way for factory reseting the phone?

I am using a rooted LG G3 D855 now, wouldn't like to flash kdz or TOT because it is pretty complicated and although I understand most of the steps, I don't want to take the risk...

Now I would like the wipe everything clean and completely reset it to the time I buy it.

Should I just go to recovery and apply "Factory reset" option? Because I was using a special recovery to do a 5 wipe including emmc wipe (internal SD), /cache, /data, dalvik chche and /preload wipe previously in my Note 1, I was thinking that was the cleanest wipe.

But since I didn't install any recovery kernal and everything is stock except rooted, I want to know the cleanest way to wipe all data completely. Also, because the recovery (Philz touch recovery) has the option to wipe external SD as well, it makes me think it wipes things more completely and more powerful...

So can anyone please give me some suggestions? Thanks in advance. Something just tell me "Factory reset" in stock recovery isn't enough to completely wipe the phone...