Is it better to use Metamask provider because it is more secure and easy for the user ? Is Metamask provider free ? with unlimited users visit / day ?
Thank you for the answer 
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If you are building a site which will connect to Ethereum, using the Metamask provider is a proven way to allow the user to interact with your dapp since the wallet management and transaction workflow is already provided for you. The Metamask provider is free and open source to use. Traffic from the Metamask extension to Infura is expected to stay within our ‘Core’ tier of 100k requests per day and a site which is overly spammy with requests may receive a message from our team if the traffic levels are overly excessive.