Fedora Rules

400 nop
350 familly time
234 drinking coffee
123 browsing
100 reading mail
93  coding
33  eating
25  stuck in traffic
17  sleeping
9    working

Mohd Izhar Firdaus Ismai is have some comments to your post about yum & Friends.

Yum is not slower than Apt, yum does dynamic load of metadata, apt dont, it only refreshes the cache when the user tell it to, so you are comparing apple and oranges.

As the main yumex developer i don’t like statements like ‘Avoid using yumex’ because it might have behaved badly. If you detect any problems the collect documentation and make bugzilla reports, so if there is any problem they cant be solved. This is the way Open Source software evolves.  Behind the scene yumex, pirut, PackageKit (yum backend) and yum-cli all works by using the powerful Yum API to do the real action, so the difference is in the UI and to the level of feature and option each tool give to the user.

it is right you can install both apt & smart in Fedora, but there is some differences,  yum has put safety in a high place, so if there is a problem in the repo of some kind, yum will bail out with an error to not leave the users systems in a broken state, but some of the other package manager have options to try to fixes the issues and it can give strange/dangerous results.

Remember don’t blame the postman for delivering a bad message.