circlejerk is best, kek. I think I'll give my own biased answer too :p
Necroing shit because I want to. Don't give too much attention to my argument, it's just the way I see the topic compared to other players who answered without any criterias.
is kinda approximative since there are several ways of being the best in a particular way/skill.
I don't know how to accurately respond, but I'll try to give an appropriate answer.
Poop, detailed shitSheer speed: With the arrival of several hot japanese players, a great asset of fast players ascended from the sky to crush us. I have some names instantly popping there. tasuke912 showed some incredible scores lately, some maps with a very awkward setting got rekted pretty fast. (Adult's toy anyone ?) shinchikuhome also deserves a mention. (well what a shame he got silenced for multi-accounting, no real surprise I think lol) I don't know about sobasuyu100, it looks like a mix between accuracy, speed and readability, it remains really impressive. I won't mention this player elsewhere, he/she can fit the accuracy category as well.
Accuracy: Hard to say, since accuracy can rely on dumb converts or simply diverse taiko maps. For the casual side, kevin3333g and kanopu are good candidates, plenty of godacc FCs everywhere, a shit ton of SSes ....
If I talk about converts or simply hard-to-acc maps, asgardv would earn a place here. For the rest, I really don't know who to nominate.
Score: Duh, my memory gets shitty there. The only thing that marked my mind was y o u j o boosting his/her score a while ago (1 or 2 years ago ?) just to get the #1 and immediately quit, it was stupid. Actually, kevin3333g is far away from the rest, so yeah ....
Read every shit: Uh really, I won't nominate anyone, better safe than nominating something absurd because I'm not sure of what I'm pointing.
Memorization: From my own memory (lol), Pheon, Ekoro and XK2238 are the only known players to have crazy FL scores all across the actual scoreboard. I won't include myself since I have only a few bunch of scores and those are only EASY converts.
Spam: Numerous names are coming to my mind right now. I'd nominate Midnaait & whosthebox for being the most early players to destroy every map containing huge 1/8 without any severe accuracy drop. But lately, more recent players like FLANKs, wzxxzw, or even Aesa (hello Mad Machine) managed to pull through spammy maps without problems.
Awkward Gameplay: Back in 2012, I remember when asuke916 (now named -Asuke-) showed us that high level Taiko is perfectly doable with a controller. I really miss that style. On a less awkward approach, I'll nominate PM____ and its strange manner of playing 2-index on the numeric keypad (something like 1, 2, 4, 5, except big notes iirc)
On an even more conventional approach, (in 2012, again) I recall xxCROSSxx and his/her outstanding performance of the 2-index playstyle, it was really cool. Noobita also had a huge skill with his ddkk style. (it's even older than every player I mentioned above) I don't know who to nominate after that.
Past periods: Well, if we go back several years in the past, I would mention Noobita, Rokodo, Ishida, youngdow (yes, remember this korean guy) and maybe MMzz too. As time passed, more players showed off their skill. I still recall zx_baka and EkiBen/Bye at this time, they weren't particuarly famous but, I still remember their scores. I may have forgotten many names lol.
Other: Huh, no, I don't have any name here.
Circlejerk: Because you all want to have a favorite player to congratulate because he/she is your friend. I'd say Ekoro. While he's clearly not the best player around, he has an astounding memory, (check standard mode, famous enough lol) a great stamina and a very good top speed to. Nothing to add on this side. It's the CIRCLEJERK, so name whoever you want :V
I think that's all for me. It's all based on my memory and my point of view, so correct me if I forgot some players.