You should not spend smaller inputs during peak times, if however you do have larger inputs to spend your transaction will be confirmed much faster even with a lower fee.
-snip-
Clients do that by default
[1].
And the amount (
balance) of the input doesn't make the transaction faster or slower, it's still the fee rate (
sat/vB).
The issue with "
smaller inputs" is a transaction might need more than 3 of them to fill the amount to be sent making the transaction's size higher,
the higher the transaction's size, the higher the total transaction fee based from the "
fee-per-vbyte" will be.
[1] Clients will select the right input(s) that's enough to pay the receiver by default, not just spend random ones.