I tried steempeak these last days and found myself still switching between frontends because I was missing minor things. Now I tried writing a post and I got Errormessage after Errormessage, so I switched back to busy and steemit.

I prefer steemit over steempeak not because it comes first but its more faster than any other app to access Steen block chain. However, if steempeak offer to vote user post once a day like what busy does. Then its a dumb choice not to use steempeak😁😁😁

If you ask busy or steempeak, i would say busy.
but your question is steemit or steempeak, then my answer is steempeak.
Steempeak is really powerful, it has beautiful UI, and a lot of tools in one single website. It has the potential to be the best.

I prefer Steemit because of its Speed as well as dullness, Steempeak still does hang sometimes. Why because it loads all the comments at once. If they improve the Speed and bring some brighter colors then Steempeak can be great alternative for Steemit or Busy.

steempeak is also good as advanced version of steemit but i dont understand why there is a need of other.

Steempeak without a doubt!

The biggest reason being that there is growing community behind it on discord https://discord.gg/g755NK and that the founders are very reachable and eager to improve their website. They are super reactive on Discord to any bug you might find, any question you want to ask or any suggestion for improving the UI you might have. 

The second reason are all of the future improvements they are going to implement in the very near future like notifications and direct messaging! Those will be game changing.

Steemit has had almost no improvements in the last year, Steempeak will never stop looking for the most intuitive way possible of using the steem blockchain and this is what is needed to bring more people to the platform.

Innovation first, with Steempeak you will have an always updated Steem experience.