"Worth" is a relative measure, and only you can decide whether the extra room and comfort of the suite is worth the 80-100 Euros extra payment. If it was me, however, I would gladly pay the 100 Euros for the deluxe suite. You should either get one of the corner suites or a bi-level "library" suite, either of which will greatly enhance your experience at the hotel and Dublin in general.
Whatever you decide, have fun.
SG