Idk if it was because I was relatively new to clanning and learnt a lot from them but they were the first ranks which stuck in my mind.
Jibs from Epidemic. F2P used to be a lot harder than just clump, push and clump as not everyone was maxed. He always seemed to find ways to disorganise his opponent, while keeping his own clan organised which ultimately led to opponents being picked off little by little - despite lower combats.
Ivp/Bob; were the masterminds behind a well oiled machine. They were the ones who motivated people internally but also the ones that came across well outside the clan. Clans today try and use propaganda for their own purposes but they come across as stupid. These two would easily spin view points and events on websites like this which seemed to enhance the reputation of their clan and maintain a 'feel' good atmosphere surrounding it. If anyone questioned them, they'd often be put down through wit and made to look stupid.
Not saying that they were the best. Obviously there have been loads throughout the years; 13th + Spelshls from MM (among others), Walli and Connor from FOE & Goop from EOP was decent too.