Before going to differentiate the PoW and PoS, we are going to discuss the basic concept of both.

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PoW is an abbreviation of Proof of Work. It is types of Concensus algorithm that work in a way in which new block is connected or added to the chain when computer solves the mathematical complexes or puzzles.

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PoS is an abbreviation of Proof of Stake. It is type of Concensus algorithm that work in the way in which new block is added to the chain after validation of block based on the weighted stake that a particular person have. All is dependent on amount of stake and reputation that we have.

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Lets discuss the difference between Proof of Work and Proof of Stake

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Proof of Work	Proof of Stack
In Proof of Work the number of Block mining is depend on how much mathematical problems and puzzles are solved	In Proof of Stack the validation of new block is depend on the how much stakes a particular person have.
in Proof of Work Validator get reward on the validation of block by solving the mathematical problems as and puzzles.	Person who validate the Block do not get benefit of reward on the behalf of Validation of Block, Validator gets network fees as reward.
It is less efficient than Proof of Stack	Proof of Stack is more efficient
It is cheaper and then POS	It is costly then POW
In Proof of Work our starting investment is to buy the Hardware	In Proof of Stack our First investment for getting stack and improve the reputation
Each Block is add to the chain after solving the mathematical problems and puzzles	In Proof of Work There is no problem solving procedure. Here Block is added to chain on the behalf of algorithms that are totally based on the Stakes of User
It is used by the well known crypto coin is Bitcoin. Function is used by Bitcoin is SHA256	Some other Alt coin are used Proof of Stack. EOS, ADA and ATOM are the coins that use Proof of Stack consensus algorithm
Its Network is Decentralized	It is Centralized in nature

Advantages and Disadvantages of PoW

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Advantages

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• PoW is decentralized based system.
• Transactions are executed in accurate, fast and reliable way.
• Validator gets reward in the form of Blocks.

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Disadvantages

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• Lot of power and electrical energy is require to solved the mathematical problems which caused as environmental pollution.
• Hacker can hack this network if hacker has 51 % mining process.
• Commercial Transactions are time consuming in proof of Work.

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Proof of Stack

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Advantages

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• If we have more stacking amount than it is efficient to validate the blocks and we do not need any technical training.
• Become a Validator is easy if we only have resources to take stakes.
• Proof of Stack is more Scalable then other.

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Disadvantages

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• Proof of Stack is centralized network in nature.
• Stuff like Reputation is dependent on the money that is staked.
• In Proof of Stack the chance of Wrong validation of Block is present.

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Which one have better scaling capacity? Eamples?

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Before comparison we will understand that what is scaling capacity. Scaling capacity means that the number of transactions execution per unit time. In this context we will see that Proof of Stack has more scaling capacity then Proof of work. This is why because Proof of work has smaller block size. In this way PoS offers good scalability performance then PoW. In Proof of Stack blocks are verified and validated on the behalf stake volume. In this way less time is consume per transaction and less energy is require to execute the transaction.

Example:

Proof of Work Transaction Executes	Proof of Stake Transaction Executes
Bitcoin Executes 7 Transactions per unit time	On the other side Polkadot executes round about one Thousand transaction per unit time
Ethereum executes Thirty Transactions per unit time	Other side TRX executes round about two thousand transactions per unit time