Gnuffone, Odin, Swzewenigen, Timinator, Master of Desaster, Master of the Dead, Master QB# all of these could contend for best player in some form or another. But they wouldn't be best on all templates. These are prolly the best for the most common templates.
It's very tough to judge who the best player on warlight is. It depends on what exactly you mean by best? Do you mean someone who does best at the most common templates? Do you mean someone who would be most likely to win their first game against someone else on a brand new template? Do you mean someone who would be most likely to win their tenth game against someone else on a brand new template? Some players can adjust their style to any template instantly, while others take a bit more time to adjust. However, some of those that take more time to adjust may perfect their play on a template, while those who adjust faster may not bother to perfect their play on the template.
Any list someone gives you of top players will be biased based on who they have played with, and who they haven't. To give a very subjective opinion, if I had to go up against one player on a random template (1v1 or team with alts) for $1 million, the player I would least want to face would be Szeweningen.
There will likely be a competition for some of the "best" players coming up soon; we've had  leagues in the past, as well as many other events, which have somewhat ranked the best at that exact time period. We just haven't had this competition really recently. I believe Latnox won the last  league, but most of the games were played well over 6 months ago IIRC.
I think maybe I should mention some guys who I believe can compete with the best all around but are not as well known as many you will see mentioned in this thread: GreenTea, Wazz, brisk
Haha, I am most definitely not the god of 1v1. I make many 1v1 games, but small earth has a large luck component to it, especially with automatic distribution. But it's a satisfying template for when I have to poop (which is more often than it should be).
*edit* I've played 3583 ranked games, of which 2724 were 1v1 (only 57% win rate).
*edit 2* I've only played master of desaster out of the players mentioned, and although I am leagues ahead him in spelling abilities, he punished my anus 2 out of 2 times.
The person I would least like to face in any given tournament is Timinator personally. Some might be better on a certain format, but overall I can't rate anyone higher right now. And Ox is right, Summer deserves to be in that conversation. Very versatile like Timi.
Yeah, saying Fizzer is slightly above average is an insult. He's not a great player IMO, but far better than average. I would say the average skill level is MUCH lower than it used to be. Sure, we still have some great players on here, but there are a lot of new players that I think lower the average skill level.