Both are inbreeding and both have similar chances of resulting in increased expression of mutations. On average brothers and sisters share ~50% of their genetic information with each other. This number is of course an average based on theory. At the same time each child is also 50% related to each parent (they did get half of their genetic information from each). The difference between sibling-sibling and parent-offspring breeding is that sibling breeding increases the possibility of expressing mutations (both deleterious and non) from both parents whereas parent-offspring breeding increases the possibility of expressing mutations from only the one parent. To further complicate the issue there are also linked genes, etc.
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Kyle

15 Milks and Kings
3 Hognose
4 Kenyan Sand Boas
3 Rat Snakes
2 Geckos

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