A seal would slide farther because all seals don't grow fur and penguins grow feathers on their whole entire body. Well actually they both might slide far because some seals do grow fur so they sometimes both will slide far.
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A penguin would slide farther than a seal because penguins have smooth and waterproof feathers that help them slide across ice more easily, while seals tend to use a crawling motion on land. Additionally, penguins often slide on their bellies over the ice, allowing them to glide further distances.
leopard seal
The both have an "e" as their second letter :)
Penguin
Penguins are birds, and do not mate with seals, which are mammals.
Emperor Penguin's use their grace, speed, and agility underwater to out swim most marine predators such as Leopard Seal's. For land... they aren't the best at getting away. Most penguin's are only really made for the sea.