Is Mouse.Key > UserInputService in terms of Performance?

Mouse.Key

local Button = {
    Key00   =   "b"
};

game:GetService("Players").LocalPlayer:GetMouse().KeyDown:Connect(function(Key)
    if (Key == "a") then
        print ("Hello World!");
    elseif (Key == Button["Key00"]) then
        print ("Hello World!")
    end
end)

UserInputService

--Enum to String (easy to do)
local String = tostring(EnumValue.Value);   --'EnumValue' is just an example, let's just say 'EnumValue' contains an EnumItem data value
    --Easy to convert with the help of 'tostring()'
----------------------------------------------------------------
--String to Enum (Painful to do, especially when doing it with multiple datas)
local Enum_String   =   "Enum.KeyCode.B";
local EnumToString  =   function(Value)
    for _, Data in next, Enum.KeyCode:GetEnumItems() do
        if (tostring(Data) == Enum_String) then
            return Data;
        end
    end
end
local Key_B =   EnumToString(Enum_String);
----------------------------------------------------------------
--Dictionary
local Button = {
    Key00   =   "d"
};
----------------------------------------------------------------
game:GetService("UserInputService").InputBegan:Connect(function(Key, Event)
    if (Key.KeyCode == Enum.KeyCode.A) then
    elseif (Key.KeyCode == Key_B) then
    elseif (Key.KeyCode == "c") then                --Will throw an error
    elseif (Key.KeyCode == Button["Key00"]) then    --Will throw an error
    elseif (Key.KeyCode == Enum.KeyCode."") then    --Will throw an error
    end
end)

Mouse.Key is easy to access, but lacks features that UserInputService have and considered deprecated, hence the majority recommends me to use UserInputService instead

I'm still using Mouse.Key because of how quick and easy to make one and easy to re-bind, I wouldn't mind it being deprecated or lacking some features, though I'm kind of worried when it comes with performance

My issue is that I'm uncertain whether Mouse.Key or UIS have their advantage performance-wise, or maybe the performance were negligible for both?

I've already stated earlier of why I'm still sticking to Mouse.Key, but another reason why I'm avoiding UIS is because of Enum usage, which has its own Data Type, and has to take extra steps to convert it (Enum>String & String>Enum), basically a pain in the ass to manage due to it being incompatible to any kinds of Data Types

And here I am, still uncertain whether migrating to UserInputService usage is worth the pain, hence I come here to ask

Any answers are appreciated, thanks in advance!