What are the features seafile server?

I am a novice user to use seafile and I do not know much about the features seafile, anything for the community version seafile private server?

whether seafile superior to the other?

Look here
Scroll down to Feature List.

whether the user is limited?

If you are going to use the CE (= Commnunity Edition), the users are unlimited
If you use the Pro Edition for free, you can use up to 3 users for free
Otherwise you have to pay for the Pro Edition as shown on the page @fabianT already posted.