"old" delta design (as Mirage III) : low drag at high speed, big fuel in the wings. Strong design. Good instantaneous turn but low sustaining turning rate (loose big energy in sharp turns).
new pure delta design (as Mirage 2000 with FBW) : same quality but lower takeoff and landing speed, better agility.
modern delta + active coupled canards (as Rafae, Gripen but not EF2000) : higher load capacity, slower takeoff and landing speed, better agility.
EF2000 is a long arm canards delta config. It was studied with vectored thrust in mind, but never installed. It is not as potent as coupled canards (compare the load capacity of the slightely smaller Rafale and the EF2000 one).
The delta plan form is more a european specialty.
At the begining, for Dassault, it was because SNECMA was unable to deliver high thrust engine, so they choose delta becasue of the need to reach mach 2+ and this config was the one with smaller drag. And we improve it thanks to FBW, canards.