Here you’ll find a brief overview of Malbec vs Merlot from regions and wine styles points of view.

Malbec is a grape variety that needs high-altitude, sun and heat to mature and bring deep color, tannins and the typical plum note.

Soil wise it gives it best in limestone soil, like those of Cahors.

Here is a quick overview of the various styles:

• Argentina Malbec has a deep color, intense fruity flavors with a velvety texture. Expect higher acidity than the French version, and cocoa powder notes.
  
  
• Cahors AOC (French Malbec) is a blend of at least 70% Malbec plus Merlot and Tannat. Has a moderate acidity and tannic structure.
  
  
• USA Malbec is primarily produced in California, Oregon and Washington. Expects dark fruit and herbal notes.
  
  
• Australia Malbec usually growth at lower altitude compared to Argentinian Malbec. Expect softer tannins, violet and aromatic notes.

Find more about Malbec here.

Merlot is planted all over the world given its versatility. Merlot gives it best in moderate to warm climates. Climates will have a direct effect on the Merlot taste profile. 

Here is a quick overview:

In cool climates, like Bordeaux in France, expect ruby color, light-medium body, higher acidity, red fruit (raspberry, cherry) flavors with tertiary notes of spice, leather, coffee, and licorice.

In warm climates, like California, expect deep ruby color, medium-full body, pronounced black fruit (blackberry, blueberry, plum) flavors, velvety tannins with tertiary notes of vanilla, coconut, and smoke.

Find more about Merlot here.