Safari Extensions Help

Hi All 🙂

OK I have a quick question ...

After recently installing the 'Disconnect' Safari Extensions https://disconnect.me I was wondering whether I can now delete 'Incognito' http://www.orbicule.com/incognito/ and 'Ghostery' https://www.ghostery.comas they all seem to be able to do the same thing except 'Disconnect' appears to be the better extension of the three?

Has anybody got any useful insight and information on these Extensions as I must admit am a little confused over them and are just judging them on how they appear to me on the surface so to speak!

Many thanks in advance, I really appreciate it