Unless you have money growing on trees, why would you dispense beer out of specification.
If you dispense Guinness with CO2, you will end up with beer pudding within hours. Closer to mousse. You will not even be able to dispense it out of the faucet. There is so little CO2 (1.2 vols.) in it that it will act like a sponge and absorb excess gas immeadiatley. Use the gas specified for Guinness. Unless your tree's leaves are falling!
As to the Bud keg, it still costs money and therefore you would desire to maintain the flavor and gas integrity the life of the keg. If you push it with the same gas (25% CO2 / 75% nitrogen) specified for Guinness, you will allow the product to become flat. This Lager has 2.5 vols. of CO2. It requires either 100% CO2 at the correct PSIG based on temp. & elevation or 60% CO2 / 40% nitrogen @ 22 PSIG or so. Unless you are raking leaves today under your money tree, dispense your Bud as above!
Argon costs three times more than nitrogen.
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