Dublin to Cork by train. The train journey time between Dublin and Cork is around 2h 37m and covers a distance of around 265 km.
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There are three main stations in Central Dublin where you can catch long-distance, intercity trains. These are Connolly, Heuston and Pearse (with the majority of Intercity services running from Connolly and Heuston).
Between these two capital cities, Dublin is definitely more touristy and Cork feels much more local. Dublin has many more tourist attractions than Cork, including the Guinness Storehouse and the Jameson Distillery. Between the two, Dublin is also considerably more famous, so it's more likely to be on tourists' radars.