This only matters if you are already far enough into grinder shopping that the material question changes the way you buy. For most people, the real question is whether the grinder feels worth buying at all. Still, if you are down to aluminum vs stainless steel, the difference is mostly about feel, weight, and how premium you want the purchase to feel.
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Quick answer
Aluminum usually makes more sense for most people because it gives you a strong balance of quality and practicality. Stainless steel makes more sense if you specifically want something heavier, more premium-feeling, and do not mind paying for that.
Why aluminum usually wins
Aluminum is usually the safer buy because it feels good enough without pushing the product into a more niche or more expensive lane.
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Why stainless steel appeals to some buyers
Stainless steel is mostly for people who want the grinder to feel more substantial and more premium in the hand.
Who should care about this
If you are the kind of buyer who notices materials and hand feel quickly, this may matter to you. If not, it probably should not drive the whole decision.
What matters more than material
Overall design, hand feel, and how the grinder behaves in real use still matter more than the label on the material.
Bottom line
Most people should treat aluminum as the safer default. Stainless steel only really wins if you know you want that heavier premium feel.