D&D 5E - Haste vs Ashardalon's Stride for a melee Warlock/Wizard

Casting haste on yourself in melee is extremely risky. If you lose concentration, it costs you an entire round. Additionally, while you do get a free attack on the casting turn, you can't use Extra Attack or green-flame blade or booming blade--so it's more like half an attack.

In the ideal case, where you can pre-buff and nobody disrupts it, haste is stronger. But considering the downside risk... you could make a case for Ashardalon's.