Aldehydes are easier to oxidize via radical mechanisms because of the ease with which one can break the C-H bond. The resulting radical is stabilized via delocalization of an oxygen lone pair.

Such stabilization is absent in an alcohol.

In a laboratory setting, alcohols tend to be more stable to air, whereas aldehydes can be prone to air oxidation.

Aldehydes are easier to oxidize via radical mechanisms because of the ease with which one can break the C-H bond. The resulting radical is stabilized via delocalization of an oxygen lone pair.

Such stabilization is absent in an alcohol. The alcohol shows a similar moiety, but I think the stabilization in the aldehyde is greater because of the shorter C-O bond, which improves orbital overlap.

In a laboratory setting, alcohols tend to be more stable to air, whereas aldehydes can be prone to air oxidation.