Cuban_8
In my experience, large jets can generally land at slower speeds when flapless than they can slatless - slats significantly increase the AoA an aerofoil can achieve before stalling.
Not always so. On the A330 Vapp with Slats 0 & Flaps Full = Vref + 25. With Slats Full & Flaps 0 = Vref + 30.