I would say those who have developed siddhis - “accomplishments” - are the pinnacle of what the human can achieve. These people have attained mastery.
I don’t know of any named Siddhas (people with Siddhis) and they tend to stay obscure on purpose. I you want all those it’s said to take many lifetimes of work.
For western occultism … different authors have different specialties and all magick is possible given a path to manifestation. You have natural mediums like Edgar Cayce, you have masters like Gurdjieff, but I would not put any of them as “best”.
Here’s my opinion on who is the best/stringest
And another that is more useful in terms of the “best deity”, meaning what entity give sthe best results, but again it comes down to you:
There’s no-one I would put over another. And I don’t think comparing ourselves to others, in this day and age especially where our whole society is corrupted by heavily parasitic psychopaths dragging everybody down spiritually, is a good yardstick.
If you are looking for goal setting, then I can give you mine. In an ideal world, I want to raise my kundalini and understand how that relates to the microcosmic orbit, I want to develop complete health and fully healed and intact DNA and be able to maintain that, I want to become fully adept with clairsentience, lucid dreaming and remote viewing and I want my life to automagickally fall into place and attract the right stuff at the right time without me having to magickally tweak it.
I don’t think whether other people have all that is my ceiling. I will try for any and all of it. I probably won’t get it unless I could study and meditate 18 hours a day for the next couple of decades, which I can’t, but any progress towards those keeps me going.