KGS for:
-Social Aspect
-Appearance/Sound
-Rating System
-Tournaments
-Reviewing Games

Wbaduk/Tygem:
-Broadcasting professional games

So really, KGS is already the ideal server save for being able to watch broadcasted professional games. If they added that, it would be almost perfect.

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Slava Ukraini!

Call me weird but I prefer the appearance of KGS and the sounds the stones make on KGS. Although I also really like Tetsuki as well.

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Slava Ukraini!

I agree with you though I can do without stone clicks. I'd like the byoyomi of Tygem or Oro as well though.

KGS - Click sound? I thought that feature wasn't supported anymore?

Tygem - I'd love to try it, but I have a Mac.

Kaya - Sadly, it seems quieter than Google Plus. I absolutely love the ability to create and share variations while watching a game in progress - an awesome feature. If Kaya picked up, I would seriously consider migrating.

FYI, I am lead to believe that Kaya now supports correspondence games, and allows you to transition between live and correspondence mode. Also cool.

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- Brady
Want to see videos of low-dan mistakes and what to learn from them? Brady's Blunders

my ideal go server would have:

kayas nice appearance and sounds

kayas innovative malkovich comments, in game variations, translations, etc.. but a little more polished (it is in beta)

both an html5 setup and a downloadable client such as cgoban that share a user base (not sure how feasible this is)

the ranking system of kgs, or kaya both seem pretty similar

the friendliness of kgs

a large userbase with plenty of high level games to watch

a library of commented pro games that you can open and review with others at your control

a library of tsumegos that you can open and review with others

kgs style of setting up games and inviting people and whatnot, (kayas instant start is a little odd)

a betting system (why not it seems like it would be fun)

an AGA room where you can play official AGA rated games (maybe video to ensure no cheating?)

A simple way to add sound and or video during a game, or reviews where the other person may accept or reject

an in house system of payment for teachers (I think go9dan has some sort of this)

Its free

Ok I think thats most of it.

Oddly, I think kaya has the worst appearance of the go servers. If they cleaned that up, I think it would be a lot better to use.