When was the last time you saw a vanilla creature (a creature with no rules text) in a new set, or even a French vanilla one (no rules text except keywords, like flying)
In general, Thalia, Guardian of Thraben is the better of the two since it comes down a turn earlier, but there is some upside (outside of budget) to playing a split of both since Thalia is legendary, so while we can never have two copies of Thalia, Guardian of Thraben on the battlefield, we can have one Thalia and one Vryn Wingmare
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This will help you set a fair and reasonable price
There might not even be anything weak about the commander itself
The lower layer also matters for resale and customer education