Originally Posted by AutoCrimson

hmm i really should search for some tier list here...

There isn't really a tier list.

The general ranking is: 6* > 5* > 5* Event Knights > 4* > 3* > 2*
Knights who have blooms are usually what you want, but if you're new you won't be blooming in a while. The list of bloomed Knights also increses every maintenance.