The docs.rs page mentions:
Consider using the Signer type if you would only have this constraint on the account.
What would be some examples where you would want to use the #[account(signer)] constraint instead of the Signer account type?
For example, when would you use something like this:
#[account(signer, <other constraints>)]
pub signer: SystemAccount<'info> // what other account types would require signing? maybe PDAs?
vs:
#[account(<other constraints>)]
pub signer: Signer<'info>
I think it's a style preference since both do the same thing.
With #[account(signer)] and AccountInfo you will also have to include the CHECK: rustdoc comment to explain why you're using an unsigned account.
But it makes things easier when I have to get the account info later in my program.
Rather than having a Signer Account type, I'll have to perform a to_account_info and clone the account in order to use/check account information.
This also improves DX since I instantly know that this is the signer.
P.S this is prior to anchor 0.29.0
