Nowt wrong with a Sirrus for commuting, 28-32mm tyres, pannier rack, proper mudguards, done. Can you do the same with the Boardman
The weight of the bike doesn’t influence smoothness of ride, the road surface and tyre width and pressure do
How far is the commute?
Go ride them both, see which is the better condition and works better for you fit and comfort wise
And obviously do everything you can to check they’re not nicked