F2P
#1 MM
#2 FOE
#3 FI
#4 EOP
#5 CP
#6 E
From mid 07 to 09/10, there was an almost unbreakable top 3 (FOE, MM and FI) - does no one remember that? For around the last 8-10 months of that phase, FI was the weakest of those three, but they were still dominant in comparison to other clans.
From 06-08 FI were prob overall the best f2p clan (I was in it), but had to beat FOE in a fullout in early 08 to take #1 officially on the PCR list. That was the peak of their powers and a few of months down the line they went down hill, slowly going into their "slump". Even while slumping, FI was part of that top 3 for a good while, so they were still "strong", just weren't living up to previous expectations.
The first clan to take advantage and break that top 3 was E, and then things opened up and after E closed EOP/CP (f2p), TLP (p2p) and DP (both servers) started competing high up. DP did well in the aftermath, but never sustained it (and closed), EOP did the best for a while, then FI took their turn again this year (from what I hear).
CP are above some smarter, more respectable clans because they've stood the test of time - which isn't necessarily a good thing - but I'll give them the benefit of the doubt because they were good in patches - even if they didn't have integrity while doing it.
P2P
#1 FOE
#2 MM
#3 TLP
#4 EOP/FI
#6 DP (IR as well)
For a VERY long time, FI/EOP's P2P game was comparatively so much worse to their F2P game.
P2P all time lists are hard to make because I hesitate to put EOP/FI - who for much of their history were totally incompetent P2P clans - above clans that had it integrated into their system throughout their history and had an overall much higher success rate on p2p trips.
I just remember throughout being in DP that if we encountered FI/EOP p2p we were going to absolutely flatten them, but we rarely did because their numbers would be short. Both clans have since improved greatly at P2P to their credit (I have to remind myself that DP closed 2 1/2 years ago).